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114 vulnerabilities by contiki-ng
CVE-2026-5857 (GCVE-0-2026-5857)
Vulnerability from nvd – Published: 2026-08-06 18:52 – Updated: 2026-08-08 02:28
VLAI
EPSS
VEX
Title
Contiki-NG MQTT Client Out-of-Bounds Write in PUBLISH Topic Parser via Persistent State Between TCP Segments
Summary
Contiki-NG's MQTT client parse_publish_vhdr() in os/net/app-layer/mqtt/mqtt.c sets topic_len_received=1 before checking topic_len against the 64-byte limit, so an over-length topic returns early but leaves the flag set. On the next TCP segment, tcp_input() re-invokes the parser with topic_received==0, and the persisted topic_len_received==1 skips the length-reading block containing the guard, falling through directly to a memcpy() that uses the unvalidated 16-bit topic_len as the copy length. The 65-byte topic[] destination overruns into adjacent struct fields including the payload_chunk pointer, which subsequent MQTT code dereferences, giving a compromised or attacker-controlled broker an arbitrary-pointer-write primitive. Contiki-NG's MQTT implementation has no TLS support so the connection is plaintext. Impact ranges from information disclosure and denial of service to remote code execution on embedded targets without memory protection.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-787 - Out-of-bounds write
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng | product |
| https://github.com/contiki-ng/contiki-ng/pull/3163 | issue-tracking |
| https://github.com/contiki-ng/contiki-ng/commit/a… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Contiki-NG | Contiki-NG |
Affected:
0 , < a34a2dbdc8bea784bd2ae5079aa4be520cd74f2d
(custom)
|
Date Public
2026-08-06 19:00
Credits
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CVE-2026-5856 (GCVE-0-2026-5856)
Vulnerability from nvd – Published: 2026-08-06 18:47 – Updated: 2026-08-07 17:41
VLAI
EPSS
VEX
Title
Contiki-NG DNS/mDNS Resolver Out-of-Bounds Read via Unchecked skip_name Traversal Before Transaction-ID Validation
Summary
Contiki-NG's DNS/mDNS resolver skip_name() in os/services/resolv/resolv.c walks DNS wire-format name labels with no packet-boundary check, and the caller in newdata() invokes it in a loop iterating nquestions times from the attacker-controlled DNS header before validating the transaction ID. An attacker who sets nquestions higher than the number of complete questions present causes skip_name() to walk past the UDP packet buffer, and the returned pointer is cast to struct dns_answer * for further memory reads. On builds with RESOLV_CONF_SUPPORTS_MDNS enabled, any peer on the local segment can trigger the read unauthenticated via a multicast UDP 5353 packet with no outstanding query required; on standard DNS builds an attacker who can inject a UDP response from port 53 during an outstanding query can trigger the same read. Impact is out-of-bounds read of uip_buf and adjacent memory, disclosing memory contents or crashing the resolver.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds read
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng | product |
| https://github.com/contiki-ng/contiki-ng/pull/3169 | issue-tracking |
| https://github.com/contiki-ng/contiki-ng/commit/0… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Contiki-NG | Contiki-NG |
Affected:
0 , < 04a3f0a0067d2ee87d1f297b6d0f4392d8c98ffe
(custom)
|
Date Public
2026-08-06 19:00
Credits
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CVE-2026-5855 (GCVE-0-2026-5855)
Vulnerability from nvd – Published: 2026-08-06 18:39 – Updated: 2026-08-07 16:19
VLAI
EPSS
VEX
Title
Contiki-NG LwM2M TLV Parser Out-of-Bounds Read via Unchecked Buffer Length in lwm2m_tlv_read
Summary
Contiki-NG's LwM2M TLV parser lwm2m_tlv_read() in os/services/lwm2m/lwm2m-tlv.c ignores its caller-supplied buffer length argument and reads up to six bytes from the input buffer with no bounds check. The caller in lwm2m-engine.c iterates while there is at least one byte remaining, so a crafted CoAP WRITE to any LwM2M endpoint whose final TLV supplies exactly one byte triggers up to five out-of-bounds reads of heap memory adjacent to the CoAP input buffer, disclosing memory contents (including key material and peer addresses) through the parsed tlv->id, tlv->length, and tlv->value fields. Corrupted tlv_len derived from the out-of-bounds memory further corrupts the caller's parse offset. In LwM2M NoSec mode, the default for constrained devices, no authentication is required.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds read
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng | product |
| https://github.com/contiki-ng/contiki-ng/pull/3165 | issue-tracking |
| https://github.com/contiki-ng/contiki-ng/commit/f… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Contiki-NG | Contiki-NG |
Affected:
0 , < f1673b5766d4d4d514cefb8a0350f43653574997
(custom)
|
Date Public
2026-08-06 19:00
Credits
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CVE-2024-47181 (GCVE-0-2024-47181)
Vulnerability from nvd – Published: 2024-11-27 18:20 – Updated: 2024-11-27 19:20
VLAI
EPSS
VEX
Title
Unaligned memory access in RPL option processing in Contiki-NG
Summary
Contiki-NG is an open-source, cross-platform operating system for IoT devices. An unaligned memory access can be triggered in the two RPL implementations of the Contiki-NG operating system. The problem can occur when either one of these RPL implementations is enabled and connected to an RPL instance. If an IPv6 packet containing an odd number of padded bytes before the RPL option, it can cause the rpl_ext_header_hbh_update function to read a 16-bit integer from an odd address. The impact of this unaligned read is architecture-dependent, but can potentially cause the system to crash. The problem has not been patched as of release 4.9, but will be included in the next release. One can apply the changes in Contiki-NG pull request #2962 to patch the system or wait for the next release.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-704 - Incorrect Type Conversion or Cast
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2962 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
<= 4.9
|
|
| contiki-ng | contiki-ng |
Affected:
0 , ≤ 4.9
(custom)
cpe:2.3:o:contiki-ng:contiki-ng:-:*:*:*:*:*:*:* |
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CVE-2024-41126 (GCVE-0-2024-41126)
Vulnerability from nvd – Published: 2024-11-27 18:20 – Updated: 2024-11-27 19:22
VLAI
EPSS
VEX
Title
Out-of-bounds read when decoding SNMP messages in Contiki-NG
Summary
Contiki-NG is an open-source, cross-platform operating system for IoT devices. An out-of-bounds read of 1 byte can be triggered when sending a packet to a device running the Contiki-NG operating system with SNMP enabled. The SNMP module is disabled in the default Contiki-NG configuration. The vulnerability exists in the os/net/app-layer/snmp/snmp-message.c module, where the snmp_message_decode function fails to check the boundary of the message buffer when reading a byte from it immediately after decoding an object identifier (OID). The problem has been patched in Contiki-NG pull request 2937. It will be included in the next release of Contiki-NG. Users are advised to either apply the patch manually or to wait for the next release. A workaround is to disable the SNMP module in the Contiki-NG build configuration.
Severity
8.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2937 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
<= 4.9
|
|
| contiki-ng | contiki-ng |
Affected:
0 , ≤ 4.9
(custom)
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CVE-2024-41125 (GCVE-0-2024-41125)
Vulnerability from nvd – Published: 2024-11-27 18:20 – Updated: 2024-11-27 19:22
VLAI
EPSS
VEX
Title
Out-of-bounds read in SNMP when decoding a string in Contiki-NG
Summary
Contiki-NG is an open-source, cross-platform operating system for IoT devices. An out-of-bounds read of 1 byte can be triggered when sending a packet to a device running the Contiki-NG operating system with SNMP enabled. The SNMP module is disabled in the default Contiki-NG configuration. The vulnerability exists in the os/net/app-layer/snmp/snmp-ber.c module, where the function snmp_ber_decode_string_len_buffer decodes the string length from a received SNMP packet. In one place, one byte is read from the buffer, without checking that the buffer has another byte available, leading to a possible out-of-bounds read. The problem has been patched in Contiki-NG pull request #2936. It will be included in the next release of Contiki-NG. Users are advised to apply the patch manually or to wait for the next release. A workaround is to disable the SNMP module in the Contiki-NG build configuration.
Severity
8.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2936 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
<= 4.9
|
|
| contiki-ng | contiki-ng |
Affected:
0 , ≤ 4.9
(custom)
cpe:2.3:o:contiki-ng:contiki-ng:-:*:*:*:*:*:*:* |
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CVE-2023-29001 (GCVE-0-2023-29001)
Vulnerability from nvd – Published: 2024-11-27 18:20 – Updated: 2024-11-27 19:22
VLAI
EPSS
VEX
Title
Uncontrolled recursion due to insufficient validation of the IPv6 source routing header in Contiki-NG
Summary
Contiki-NG is an open-source, cross-platform operating system for IoT devices. The Contiki-NG operating system processes source routing headers (SRH) in its two alternative RPL protocol implementations. The IPv6 implementation uses the results of this processing to determine whether an incoming packet should be forwarded to another host. Because of missing validation of the resulting next-hop address, an uncontrolled recursion may occur in the tcpip_ipv6_output function in the os/net/ipv6/tcpip.c module when receiving a packet with a next-hop address that is a local address. Attackers that have the possibility to send IPv6 packets to the Contiki-NG host can therefore trigger deeply nested recursive calls, which can cause a stack overflow. The vulnerability has not been patched in the current release of Contiki-NG, but is expected to be patched in the next release. The problem can be fixed by applying the patch in Contiki-NG pull request #2264. Users are advised to either apply the patch manually or to wait for the next release. There are no known workarounds for this vulnerability.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-674 - Uncontrolled Recursion
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2264 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
<= 4.9
|
|
| contiki-ng | contiki-ng |
Affected:
0 , ≤ 4.9
(custom)
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CVE-2023-50927 (GCVE-0-2023-50927)
Vulnerability from nvd – Published: 2024-02-14 19:22 – Updated: 2025-04-24 15:15
VLAI
EPSS
VEX
Title
Insufficient boundary checks for DIO and DAO messages in RPL-Lite in Contiki-NG
Summary
Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An attacker can trigger out-of-bounds reads in the RPL-Lite implementation of the RPL protocol in the Contiki-NG operating system. This vulnerability is caused by insufficient control of the lengths for DIO and DAO messages, in particular when they contain RPL sub-option headers. The problem has been patched in Contiki-NG 4.9. Users are advised to upgrade. Users unable to upgrade should manually apply the code changes in PR #2484.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2484 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
< 4.9
|
|
| contiki-ng | contiki-ng |
Affected:
0 , < 4.9
(custom)
cpe:2.3:o:contiki-ng:contiki-ng:4.9:*:*:*:*:*:*:* |
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CVE-2023-50926 (GCVE-0-2023-50926)
Vulnerability from nvd – Published: 2024-02-14 19:28 – Updated: 2024-08-02 22:23
VLAI
EPSS
VEX
Title
Unvalidated DIO prefix info length in RPL-Lite in Contiki-NG
Summary
Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds read can be caused by an incoming DIO message when using the RPL-Lite implementation in the Contiki-NG operating system. More specifically, the prefix information of the DIO message contains a field that specifies the length of an IPv6 address prefix. The value of this field is not validated, which means that an attacker can set a value that is longer than the maximum prefix length. Subsequently, a memcmp function call that compares different prefixes can be called with a length argument that surpasses the boundary of the array allocated for the prefix, causing an out-of-bounds read. The problem has been patched in the "develop" branch of Contiki-NG, and is expected to be included in the next release. Users are advised to update as soon as they are able to or to manually apply the changes in Contiki-NG pull request #2721.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2721 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
<= 4.9
|
|
| contiki-ng | contiki-ng |
Affected:
0 , ≤ 4.9
(custom)
cpe:2.3:a:contiki-ng:contiki-ng:*:*:*:*:*:*:*:* |
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CVE-2023-48229 (GCVE-0-2023-48229)
Vulnerability from nvd – Published: 2024-02-14 18:30 – Updated: 2024-08-02 21:23
VLAI
EPSS
VEX
Title
Out-of-bounds write in the radio driver for Contiki-NG nRF platforms
Summary
Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds write exists in the driver for IEEE 802.15.4 radios on nRF platforms in the Contiki-NG operating system. The problem is triggered when parsing radio frames in the `read_frame` function in the `arch/cpu/nrf/net/nrf-ieee-driver-arch.c` module. More specifically, the `read_frame` function performs an incomplete validation of the payload length of the packet, which is a value that can be set by an external party that sends radio packets to a Contiki-NG system. Although the value is validated to be in the range of the MTU length, it is not validated to fit into the given buffer into which the packet will be copied. The problem has been patched in the "develop" branch of Contiki-NG and is expected to be included in subsequent releases. Users are advised to update their develop branch or to update to a subsequent release when available. Users unable to upgrade should consider manually applying the changes in PR #2741.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2741 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
<= 4.9
|
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CVE-2021-42147 (GCVE-0-2021-42147)
Vulnerability from nvd – Published: 2024-01-24 00:00 – Updated: 2025-05-30 14:17
VLAI
EPSS
VEX
Summary
Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS through master branch 53a0d97 allows remote attackers to cause a denial of service via crafted data packet.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-125 - Out-of-bounds Read
Assigner
References
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CVE-2021-42146 (GCVE-0-2021-42146)
Vulnerability from nvd – Published: 2024-01-24 00:00 – Updated: 2025-06-20 19:19
VLAI
EPSS
VEX
Summary
An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers allow remote attackers to reuse the same epoch number within two times the TCP maximum segment lifetime, which is prohibited in RFC6347. This vulnerability allows remote attackers to obtain sensitive application (data of connected clients).
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
References
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CVE-2021-42145 (GCVE-0-2021-42145)
Vulnerability from nvd – Published: 2024-01-24 00:00 – Updated: 2025-06-20 19:17
VLAI
EPSS
VEX
Summary
An assertion failure discovered in in check_certificate_request() in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers to cause a denial of service.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-755 - Improper Handling of Exceptional Conditions
Assigner
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CVE-2021-42144 (GCVE-0-2021-42144)
Vulnerability from nvd – Published: 2024-01-24 00:00 – Updated: 2025-06-20 19:16
VLAI
EPSS
VEX
Summary
Buffer over-read vulnerability in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers obtain sensitive information via crafted input to dtls_ccm_decrypt_message().
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-125 - Out-of-bounds Read
Assigner
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CVE-2021-42143 (GCVE-0-2021-42143)
Vulnerability from nvd – Published: 2024-01-24 00:00 – Updated: 2025-06-20 19:16
VLAI
EPSS
VEX
Summary
An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. An infinite loop bug exists during the handling of a ClientHello handshake message. This bug allows remote attackers to cause a denial of service by sending a malformed ClientHello handshake message with an odd length of cipher suites, which triggers an infinite loop (consuming all resources) and a buffer over-read that can disclose sensitive information.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
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CVE-2026-5857 (GCVE-0-2026-5857)
Vulnerability from cvelistv5 – Published: 2026-08-06 18:52 – Updated: 2026-08-08 02:28
VLAI
EPSS
VEX
Title
Contiki-NG MQTT Client Out-of-Bounds Write in PUBLISH Topic Parser via Persistent State Between TCP Segments
Summary
Contiki-NG's MQTT client parse_publish_vhdr() in os/net/app-layer/mqtt/mqtt.c sets topic_len_received=1 before checking topic_len against the 64-byte limit, so an over-length topic returns early but leaves the flag set. On the next TCP segment, tcp_input() re-invokes the parser with topic_received==0, and the persisted topic_len_received==1 skips the length-reading block containing the guard, falling through directly to a memcpy() that uses the unvalidated 16-bit topic_len as the copy length. The 65-byte topic[] destination overruns into adjacent struct fields including the payload_chunk pointer, which subsequent MQTT code dereferences, giving a compromised or attacker-controlled broker an arbitrary-pointer-write primitive. Contiki-NG's MQTT implementation has no TLS support so the connection is plaintext. Impact ranges from information disclosure and denial of service to remote code execution on embedded targets without memory protection.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-787 - Out-of-bounds write
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng | product |
| https://github.com/contiki-ng/contiki-ng/pull/3163 | issue-tracking |
| https://github.com/contiki-ng/contiki-ng/commit/a… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Contiki-NG | Contiki-NG |
Affected:
0 , < a34a2dbdc8bea784bd2ae5079aa4be520cd74f2d
(custom)
|
Date Public
2026-08-06 19:00
Credits
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CVE-2026-5856 (GCVE-0-2026-5856)
Vulnerability from cvelistv5 – Published: 2026-08-06 18:47 – Updated: 2026-08-07 17:41
VLAI
EPSS
VEX
Title
Contiki-NG DNS/mDNS Resolver Out-of-Bounds Read via Unchecked skip_name Traversal Before Transaction-ID Validation
Summary
Contiki-NG's DNS/mDNS resolver skip_name() in os/services/resolv/resolv.c walks DNS wire-format name labels with no packet-boundary check, and the caller in newdata() invokes it in a loop iterating nquestions times from the attacker-controlled DNS header before validating the transaction ID. An attacker who sets nquestions higher than the number of complete questions present causes skip_name() to walk past the UDP packet buffer, and the returned pointer is cast to struct dns_answer * for further memory reads. On builds with RESOLV_CONF_SUPPORTS_MDNS enabled, any peer on the local segment can trigger the read unauthenticated via a multicast UDP 5353 packet with no outstanding query required; on standard DNS builds an attacker who can inject a UDP response from port 53 during an outstanding query can trigger the same read. Impact is out-of-bounds read of uip_buf and adjacent memory, disclosing memory contents or crashing the resolver.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds read
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng | product |
| https://github.com/contiki-ng/contiki-ng/pull/3169 | issue-tracking |
| https://github.com/contiki-ng/contiki-ng/commit/0… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Contiki-NG | Contiki-NG |
Affected:
0 , < 04a3f0a0067d2ee87d1f297b6d0f4392d8c98ffe
(custom)
|
Date Public
2026-08-06 19:00
Credits
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CVE-2026-5855 (GCVE-0-2026-5855)
Vulnerability from cvelistv5 – Published: 2026-08-06 18:39 – Updated: 2026-08-07 16:19
VLAI
EPSS
VEX
Title
Contiki-NG LwM2M TLV Parser Out-of-Bounds Read via Unchecked Buffer Length in lwm2m_tlv_read
Summary
Contiki-NG's LwM2M TLV parser lwm2m_tlv_read() in os/services/lwm2m/lwm2m-tlv.c ignores its caller-supplied buffer length argument and reads up to six bytes from the input buffer with no bounds check. The caller in lwm2m-engine.c iterates while there is at least one byte remaining, so a crafted CoAP WRITE to any LwM2M endpoint whose final TLV supplies exactly one byte triggers up to five out-of-bounds reads of heap memory adjacent to the CoAP input buffer, disclosing memory contents (including key material and peer addresses) through the parsed tlv->id, tlv->length, and tlv->value fields. Corrupted tlv_len derived from the out-of-bounds memory further corrupts the caller's parse offset. In LwM2M NoSec mode, the default for constrained devices, no authentication is required.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds read
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng | product |
| https://github.com/contiki-ng/contiki-ng/pull/3165 | issue-tracking |
| https://github.com/contiki-ng/contiki-ng/commit/f… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Contiki-NG | Contiki-NG |
Affected:
0 , < f1673b5766d4d4d514cefb8a0350f43653574997
(custom)
|
Date Public
2026-08-06 19:00
Credits
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CVE-2023-29001 (GCVE-0-2023-29001)
Vulnerability from cvelistv5 – Published: 2024-11-27 18:20 – Updated: 2024-11-27 19:22
VLAI
EPSS
VEX
Title
Uncontrolled recursion due to insufficient validation of the IPv6 source routing header in Contiki-NG
Summary
Contiki-NG is an open-source, cross-platform operating system for IoT devices. The Contiki-NG operating system processes source routing headers (SRH) in its two alternative RPL protocol implementations. The IPv6 implementation uses the results of this processing to determine whether an incoming packet should be forwarded to another host. Because of missing validation of the resulting next-hop address, an uncontrolled recursion may occur in the tcpip_ipv6_output function in the os/net/ipv6/tcpip.c module when receiving a packet with a next-hop address that is a local address. Attackers that have the possibility to send IPv6 packets to the Contiki-NG host can therefore trigger deeply nested recursive calls, which can cause a stack overflow. The vulnerability has not been patched in the current release of Contiki-NG, but is expected to be patched in the next release. The problem can be fixed by applying the patch in Contiki-NG pull request #2264. Users are advised to either apply the patch manually or to wait for the next release. There are no known workarounds for this vulnerability.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-674 - Uncontrolled Recursion
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2264 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
<= 4.9
|
|
| contiki-ng | contiki-ng |
Affected:
0 , ≤ 4.9
(custom)
cpe:2.3:o:contiki-ng:contiki-ng:-:*:*:*:*:*:*:* |
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CVE-2024-41125 (GCVE-0-2024-41125)
Vulnerability from cvelistv5 – Published: 2024-11-27 18:20 – Updated: 2024-11-27 19:22
VLAI
EPSS
VEX
Title
Out-of-bounds read in SNMP when decoding a string in Contiki-NG
Summary
Contiki-NG is an open-source, cross-platform operating system for IoT devices. An out-of-bounds read of 1 byte can be triggered when sending a packet to a device running the Contiki-NG operating system with SNMP enabled. The SNMP module is disabled in the default Contiki-NG configuration. The vulnerability exists in the os/net/app-layer/snmp/snmp-ber.c module, where the function snmp_ber_decode_string_len_buffer decodes the string length from a received SNMP packet. In one place, one byte is read from the buffer, without checking that the buffer has another byte available, leading to a possible out-of-bounds read. The problem has been patched in Contiki-NG pull request #2936. It will be included in the next release of Contiki-NG. Users are advised to apply the patch manually or to wait for the next release. A workaround is to disable the SNMP module in the Contiki-NG build configuration.
Severity
8.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2936 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
<= 4.9
|
|
| contiki-ng | contiki-ng |
Affected:
0 , ≤ 4.9
(custom)
cpe:2.3:o:contiki-ng:contiki-ng:-:*:*:*:*:*:*:* |
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CVE-2024-41126 (GCVE-0-2024-41126)
Vulnerability from cvelistv5 – Published: 2024-11-27 18:20 – Updated: 2024-11-27 19:22
VLAI
EPSS
VEX
Title
Out-of-bounds read when decoding SNMP messages in Contiki-NG
Summary
Contiki-NG is an open-source, cross-platform operating system for IoT devices. An out-of-bounds read of 1 byte can be triggered when sending a packet to a device running the Contiki-NG operating system with SNMP enabled. The SNMP module is disabled in the default Contiki-NG configuration. The vulnerability exists in the os/net/app-layer/snmp/snmp-message.c module, where the snmp_message_decode function fails to check the boundary of the message buffer when reading a byte from it immediately after decoding an object identifier (OID). The problem has been patched in Contiki-NG pull request 2937. It will be included in the next release of Contiki-NG. Users are advised to either apply the patch manually or to wait for the next release. A workaround is to disable the SNMP module in the Contiki-NG build configuration.
Severity
8.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2937 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
<= 4.9
|
|
| contiki-ng | contiki-ng |
Affected:
0 , ≤ 4.9
(custom)
cpe:2.3:o:contiki-ng:contiki-ng:-:*:*:*:*:*:*:* |
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CVE-2024-47181 (GCVE-0-2024-47181)
Vulnerability from cvelistv5 – Published: 2024-11-27 18:20 – Updated: 2024-11-27 19:20
VLAI
EPSS
VEX
Title
Unaligned memory access in RPL option processing in Contiki-NG
Summary
Contiki-NG is an open-source, cross-platform operating system for IoT devices. An unaligned memory access can be triggered in the two RPL implementations of the Contiki-NG operating system. The problem can occur when either one of these RPL implementations is enabled and connected to an RPL instance. If an IPv6 packet containing an odd number of padded bytes before the RPL option, it can cause the rpl_ext_header_hbh_update function to read a 16-bit integer from an odd address. The impact of this unaligned read is architecture-dependent, but can potentially cause the system to crash. The problem has not been patched as of release 4.9, but will be included in the next release. One can apply the changes in Contiki-NG pull request #2962 to patch the system or wait for the next release.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-704 - Incorrect Type Conversion or Cast
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2962 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
<= 4.9
|
|
| contiki-ng | contiki-ng |
Affected:
0 , ≤ 4.9
(custom)
cpe:2.3:o:contiki-ng:contiki-ng:-:*:*:*:*:*:*:* |
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CVE-2023-50926 (GCVE-0-2023-50926)
Vulnerability from cvelistv5 – Published: 2024-02-14 19:28 – Updated: 2024-08-02 22:23
VLAI
EPSS
VEX
Title
Unvalidated DIO prefix info length in RPL-Lite in Contiki-NG
Summary
Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds read can be caused by an incoming DIO message when using the RPL-Lite implementation in the Contiki-NG operating system. More specifically, the prefix information of the DIO message contains a field that specifies the length of an IPv6 address prefix. The value of this field is not validated, which means that an attacker can set a value that is longer than the maximum prefix length. Subsequently, a memcmp function call that compares different prefixes can be called with a length argument that surpasses the boundary of the array allocated for the prefix, causing an out-of-bounds read. The problem has been patched in the "develop" branch of Contiki-NG, and is expected to be included in the next release. Users are advised to update as soon as they are able to or to manually apply the changes in Contiki-NG pull request #2721.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2721 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
<= 4.9
|
|
| contiki-ng | contiki-ng |
Affected:
0 , ≤ 4.9
(custom)
cpe:2.3:a:contiki-ng:contiki-ng:*:*:*:*:*:*:*:* |
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CVE-2023-50927 (GCVE-0-2023-50927)
Vulnerability from cvelistv5 – Published: 2024-02-14 19:22 – Updated: 2025-04-24 15:15
VLAI
EPSS
VEX
Title
Insufficient boundary checks for DIO and DAO messages in RPL-Lite in Contiki-NG
Summary
Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An attacker can trigger out-of-bounds reads in the RPL-Lite implementation of the RPL protocol in the Contiki-NG operating system. This vulnerability is caused by insufficient control of the lengths for DIO and DAO messages, in particular when they contain RPL sub-option headers. The problem has been patched in Contiki-NG 4.9. Users are advised to upgrade. Users unable to upgrade should manually apply the code changes in PR #2484.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-125 - Out-of-bounds Read
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2484 | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
< 4.9
|
|
| contiki-ng | contiki-ng |
Affected:
0 , < 4.9
(custom)
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CVE-2023-48229 (GCVE-0-2023-48229)
Vulnerability from cvelistv5 – Published: 2024-02-14 18:30 – Updated: 2024-08-02 21:23
VLAI
EPSS
VEX
Title
Out-of-bounds write in the radio driver for Contiki-NG nRF platforms
Summary
Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds write exists in the driver for IEEE 802.15.4 radios on nRF platforms in the Contiki-NG operating system. The problem is triggered when parsing radio frames in the `read_frame` function in the `arch/cpu/nrf/net/nrf-ieee-driver-arch.c` module. More specifically, the `read_frame` function performs an incomplete validation of the payload length of the packet, which is a value that can be set by an external party that sends radio packets to a Contiki-NG system. Although the value is validated to be in the range of the MTU length, it is not validated to fit into the given buffer into which the packet will be copied. The problem has been patched in the "develop" branch of Contiki-NG and is expected to be included in subsequent releases. Users are advised to update their develop branch or to update to a subsequent release when available. Users unable to upgrade should consider manually applying the changes in PR #2741.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/contiki-ng/contiki-ng/security… | x_refsource_CONFIRM |
| https://github.com/contiki-ng/contiki-ng/pull/2741 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| contiki-ng | contiki-ng |
Affected:
<= 4.9
|
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CVE-2021-42144 (GCVE-0-2021-42144)
Vulnerability from cvelistv5 – Published: 2024-01-24 00:00 – Updated: 2025-06-20 19:16
VLAI
EPSS
VEX
Summary
Buffer over-read vulnerability in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers obtain sensitive information via crafted input to dtls_ccm_decrypt_message().
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-125 - Out-of-bounds Read
Assigner
References
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CVE-2021-42145 (GCVE-0-2021-42145)
Vulnerability from cvelistv5 – Published: 2024-01-24 00:00 – Updated: 2025-06-20 19:17
VLAI
EPSS
VEX
Summary
An assertion failure discovered in in check_certificate_request() in Contiki-NG tinyDTLS through master branch 53a0d97 allows attackers to cause a denial of service.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-755 - Improper Handling of Exceptional Conditions
Assigner
References
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CVE-2021-42146 (GCVE-0-2021-42146)
Vulnerability from cvelistv5 – Published: 2024-01-24 00:00 – Updated: 2025-06-20 19:19
VLAI
EPSS
VEX
Summary
An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers allow remote attackers to reuse the same epoch number within two times the TCP maximum segment lifetime, which is prohibited in RFC6347. This vulnerability allows remote attackers to obtain sensitive application (data of connected clients).
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-303 - Incorrect Implementation of Authentication Algorithm
Assigner
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CVE-2021-42143 (GCVE-0-2021-42143)
Vulnerability from cvelistv5 – Published: 2024-01-24 00:00 – Updated: 2025-06-20 19:16
VLAI
EPSS
VEX
Summary
An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. An infinite loop bug exists during the handling of a ClientHello handshake message. This bug allows remote attackers to cause a denial of service by sending a malformed ClientHello handshake message with an odd length of cipher suites, which triggers an infinite loop (consuming all resources) and a buffer over-read that can disclose sensitive information.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
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CVE-2021-42147 (GCVE-0-2021-42147)
Vulnerability from cvelistv5 – Published: 2024-01-24 00:00 – Updated: 2025-05-30 14:17
VLAI
EPSS
VEX
Summary
Buffer over-read vulnerability in the dtls_sha256_update function in Contiki-NG tinyDTLS through master branch 53a0d97 allows remote attackers to cause a denial of service via crafted data packet.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-125 - Out-of-bounds Read
Assigner
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