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Common Weakness Enumeration

CWE-170

Allowed

Improper Null Termination

Abstraction: Base · Status: Incomplete

API response cwe.mitre.org

The product does not terminate or incorrectly terminates a string or array with a null character or equivalent terminator.

86 vulnerabilities reference this CWE, most recent first.

CVE-2019-11044 (GCVE-0-2019-11044)

Vulnerability from cvelistv5 – Published: 2019-12-23 02:40 – Updated: 2024-09-17 01:47
VLAI
Title
link() silently truncates after a null byte on Windows
Summary
In PHP versions 7.2.x below 7.2.26, 7.3.x below 7.3.13 and 7.4.0 on Windows, PHP link() function accepts filenames with embedded \0 byte and treats them as terminating at that byte. This could lead to security vulnerabilities, e.g. in applications checking paths that the code is allowed to access.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-170 - Improper Null Termination
Assigner
References
Impacted products
Vendor Product Version
PHP Group PHP Affected: 7.2.x , < 7.2.26 (custom)
Affected: 7.3.x , < 7.3.13 (custom)
Affected: 7.4.x , < 7.4.1 (custom)
Create a notification for this product.
Date Public
2019-12-17 00:00
Credits
Submitted by ryat at php.net
Show details on NVD website
To clipboard 

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CVE-2019-8275 (GCVE-0-2019-8275)

Vulnerability from cvelistv5 – Published: 2019-03-09 00:00 – Updated: 2024-09-17 03:12
VLAI
Summary
UltraVNC revision 1211 has multiple improper null termination vulnerabilities in VNC server code, which result in out-of-bound data being accessed by remote users. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1212.
Severity
No CVSS data available.
CWE
  • CWE-170 - Improper Null Termination
Assigner
References
Impacted products
Vendor Product Version
Kaspersky Lab UltraVNC Affected: 1.2.2.3
Create a notification for this product.
Date Public
2019-03-01 00:00
Show details on NVD website
To clipboard 

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GHSA-2GMP-X9R7-XP6Q

Vulnerability from github – Published: 2024-09-18 15:30 – Updated: 2024-09-20 21:31
VLAI
Details

Improper Null Termination vulnerability in Open Networking Foundation (ONF) libfluid (libfluid_msg module). This vulnerability is associated with program routine fluid_msg::of10::Port:unpack.

This issue affects libfluid: 0.1.0.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Show details on source website
To clipboard 

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  },
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  "id": "GHSA-2gmp-x9r7-xp6q",
  "modified": "2024-09-20T21:31:39Z",
  "published": "2024-09-18T15:30:52Z",
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}

GHSA-2QJX-H626-J6V4

Vulnerability from github – Published: 2026-02-26 18:31 – Updated: 2026-02-27 15:34
VLAI
Details

Golioth Firmware SDK version 0.19.1 prior to 0.22.0, fixed in commit 0e788217, contain an out-of-bounds read due to improper null termination of a blockwise transfer path. blockwise_transfer_init() accepts a path whose length equals CONFIG_GOLIOTH_COAP_MAX_PATH_LEN and copies it using strncpy() without guaranteeing a trailing NUL byte, leaving ctx->path unterminated. A later strlen() on this buffer (in golioth_coap_client_get_internal()) can read past the end of the allocation, resulting in a crash/denial of service. The input is application-controlled (not network by default).

Severity
2.9 (Low)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
2.1 (Low)
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Show details on source website
To clipboard 

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    "severity": "LOW"
  },
  "details": "Golioth Firmware SDK version\u00a00.19.1\u00a0prior to 0.22.0, fixed in commit\u00a00e788217, contain an out-of-bounds read due to improper null termination of a blockwise transfer path. blockwise_transfer_init() accepts a path whose length equals CONFIG_GOLIOTH_COAP_MAX_PATH_LEN and copies it using strncpy() without guaranteeing a trailing NUL byte, leaving ctx-\u003epath unterminated. A later strlen() on this buffer (in golioth_coap_client_get_internal()) can read past the end of the allocation, resulting in a crash/denial of service. The input is application-controlled (not network by default).",
  "id": "GHSA-2qjx-h626-j6v4",
  "modified": "2026-02-27T15:34:17Z",
  "published": "2026-02-26T18:31:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23749"
    },
    {
      "type": "WEB",
      "url": "https://github.com/golioth/golioth-firmware-sdk/commit/0e788217ab4b61a7c1d9fadd1b4a40f5f538a26d"
    },
    {
      "type": "WEB",
      "url": "https://blog.secmate.dev/posts/golioth-vulnerabilities-disclosure"
    },
    {
      "type": "WEB",
      "url": "https://github.com/golioth/golioth-firmware-sdk/releases/tag/v0.22.0"
    },
    {
      "type": "WEB",
      "url": "https://secmate.dev/disclosures/SECMATE-2025-0017"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/golioth-firmware-sdk-blockwise-transfer-path-out-of-bounds-read"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

GHSA-42VC-VFQH-CR2X

Vulnerability from github – Published: 2024-05-14 18:30 – Updated: 2024-11-27 21:32
VLAI
Details

A vulnerability has been identified in CPC80 Central Processing/Communication (All versions < V16.41), CPCI85 Central Processing/Communication (All versions < V5.30). The affected device firmwares contain an improper null termination vulnerability while parsing a specific HTTP header. This could allow an attacker to execute code in the context of the current process or lead to denial of service condition.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.3 (High)
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2024-31484"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-170"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-14T16:16:50Z",
    "severity": "HIGH"
  },
  "details": "A vulnerability has been identified in CPC80 Central Processing/Communication (All versions \u003c V16.41), CPCI85 Central Processing/Communication (All versions \u003c V5.30). The affected device firmwares contain an improper null termination vulnerability while parsing a specific HTTP header. This could allow an attacker to execute code in the context of the current process or lead to denial of service condition.",
  "id": "GHSA-42vc-vfqh-cr2x",
  "modified": "2024-11-27T21:32:43Z",
  "published": "2024-05-14T18:30:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-31484"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-620338.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-871704.html"
    },
    {
      "type": "WEB",
      "url": "http://seclists.org/fulldisclosure/2024/Jul/4"
    },
    {
      "type": "WEB",
      "url": "http://seclists.org/fulldisclosure/2024/Nov/18"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

GHSA-44MV-GF6J-PVGX

Vulnerability from github – Published: 2022-12-18 06:31 – Updated: 2022-12-22 18:30
VLAI
Details

An issue was discovered in drachtio-server before 0.8.20. It allows remote attackers to cause a denial of service (daemon crash) via a long message in a TCP request that leads to std::length_error.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2022-47515"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-170"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-12-18T05:15:00Z",
    "severity": "HIGH"
  },
  "details": "An issue was discovered in drachtio-server before 0.8.20. It allows remote attackers to cause a denial of service (daemon crash) via a long message in a TCP request that leads to std::length_error.",
  "id": "GHSA-44mv-gf6j-pvgx",
  "modified": "2022-12-22T18:30:24Z",
  "published": "2022-12-18T06:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-47515"
    },
    {
      "type": "WEB",
      "url": "https://github.com/drachtio/drachtio-server/issues/245"
    },
    {
      "type": "WEB",
      "url": "https://github.com/drachtio/drachtio-server/commit/4cf9fe2c420b86c16442215d449d40be777c1911"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-4V8W-GMWJ-MQP6

Vulnerability from github – Published: 2022-05-24 17:45 – Updated: 2022-10-29 12:00
VLAI
Details

Multiple vulnerabilities in Cisco Jabber for Windows, Cisco Jabber for MacOS, and Cisco Jabber for mobile platforms could allow an attacker to execute arbitrary programs on the underlying operating system with elevated privileges, access sensitive information, intercept protected network traffic, or cause a denial of service (DoS) condition. For more information about these vulnerabilities, see the Details section of this advisory.

Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2021-1417"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-170",
      "CWE-200"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-03-24T21:15:00Z",
    "severity": "MODERATE"
  },
  "details": "Multiple vulnerabilities in Cisco Jabber for Windows, Cisco Jabber for MacOS, and Cisco Jabber for mobile platforms could allow an attacker to execute arbitrary programs on the underlying operating system with elevated privileges, access sensitive information, intercept protected network traffic, or cause a denial of service (DoS) condition. For more information about these vulnerabilities, see the Details section of this advisory.",
  "id": "GHSA-4v8w-gmwj-mqp6",
  "modified": "2022-10-29T12:00:32Z",
  "published": "2022-05-24T17:45:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-1417"
    },
    {
      "type": "WEB",
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cisco-jabber-PWrTATTC"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-5HV9-VFR9-4MH3

Vulnerability from github – Published: 2024-09-05 06:31 – Updated: 2024-09-05 15:33
VLAI
Details

A missing null-termination character in the last element of an nvlist array string can lead to writing outside the allocated buffer.

Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2024-45288"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-170"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-05T04:15:07Z",
    "severity": "HIGH"
  },
  "details": "A missing null-termination character in the last element of an nvlist array string can lead to writing outside the allocated buffer.",
  "id": "GHSA-5hv9-vfr9-4mh3",
  "modified": "2024-09-05T15:33:35Z",
  "published": "2024-09-05T06:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-45288"
    },
    {
      "type": "WEB",
      "url": "https://security.freebsd.org/advisories/FreeBSD-SA-24:09.libnv.asc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-5VWC-HH96-8X8G

Vulnerability from github – Published: 2025-12-31 09:30 – Updated: 2025-12-31 09:30
VLAI
Details

The NPort 6100-G2/6200-G2 Series is affected by a high-severity vulnerability (CVE-2025-2026) that allows remote attackers to execute a null byte injection through the device’s web API. This may lead to an unexpected device reboot and result in a denial-of-service (DoS) condition.

An authenticated remote attacker with web read-only privileges can exploit the vulnerable API to inject malicious input. Successful exploitation may cause the device to reboot, disrupting normal operations and causing a temporary denial of service.

Severity
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2025-2026"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-170"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-31T08:15:45Z",
    "severity": "HIGH"
  },
  "details": "The NPort 6100-G2/6200-G2 Series is affected by a high-severity vulnerability (CVE-2025-2026) that allows remote attackers to execute a null byte injection through the device\u2019s web API. This may lead to an unexpected device reboot and result in a denial-of-service (DoS) condition.\n\nAn authenticated remote attacker with web read-only privileges can exploit the vulnerable API to inject malicious input. Successful exploitation may cause the device to reboot, disrupting normal operations and causing a temporary denial of service.",
  "id": "GHSA-5vwc-hh96-8x8g",
  "modified": "2025-12-31T09:30:19Z",
  "published": "2025-12-31T09:30:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-2026"
    },
    {
      "type": "WEB",
      "url": "https://www.moxa.com/en/support/product-support/security-advisory/mpsa-251731-cve-2025-1977-cve-2025-2026-multiple-vulnerabilities-in-nport-6100-g2-6200-g2-series"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

GHSA-6XW6-4HXH-3V2W

Vulnerability from github – Published: 2022-05-24 17:48 – Updated: 2022-05-24 17:48
VLAI
Details

A vulnerability has been identified in Nucleus 4 (All versions < V4.1.0), Nucleus NET (All versions), Nucleus RTOS (versions including affected DNS modules), Nucleus ReadyStart (All versions < V2017.02.3), Nucleus Source Code (versions including affected DNS modules), SIMOTICS CONNECT 400 (All versions < V0.5.0.0), VSTAR (versions including affected DNS modules). The DNS domain name label parsing functionality does not properly validate the null-terminated name in DNS-responses. The parsing of malformed responses could result in a read past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to cause a denial-of-service condition or leak the read memory.

Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2020-27736"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125",
      "CWE-170",
      "CWE-193"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-04-22T21:15:00Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability has been identified in Nucleus 4 (All versions \u003c V4.1.0), Nucleus NET (All versions), Nucleus RTOS (versions including affected DNS modules), Nucleus ReadyStart (All versions \u003c V2017.02.3), Nucleus Source Code (versions including affected DNS modules), SIMOTICS CONNECT 400 (All versions \u003c V0.5.0.0), VSTAR (versions including affected DNS modules). The DNS domain name label parsing functionality does not properly validate the null-terminated name in DNS-responses. The parsing of malformed responses could result in a read past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to cause a denial-of-service condition or leak the read memory.",
  "id": "GHSA-6xw6-4hxh-3v2w",
  "modified": "2022-05-24T17:48:18Z",
  "published": "2022-05-24T17:48:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-27736"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}
Mitigation
Requirements

Use a language that is not susceptible to these issues. However, be careful of null byte interaction errors (CWE-626) with lower-level constructs that may be written in a language that is susceptible.

Mitigation
Implementation

Ensure that all string functions used are understood fully as to how they append null characters. Also, be wary of off-by-one errors when appending nulls to the end of strings.

Mitigation
Implementation

If performance constraints permit, special code can be added that validates null-termination of string buffers, this is a rather naive and error-prone solution.

Mitigation
Implementation

Switch to bounded string manipulation functions. Inspect buffer lengths involved in the buffer overrun trace reported with the defect.

Mitigation
Implementation

Add code that fills buffers with nulls (however, the length of buffers still needs to be inspected, to ensure that the non null-terminated string is not written at the physical end of the buffer).

No CAPEC attack patterns related to this CWE.

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