Common Weakness Enumeration
CWE-444
AllowedInconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Abstraction: Base · Status: Incomplete
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
551 vulnerabilities reference this CWE, most recent first.
CVE-2021-38162 (GCVE-0-2021-38162)
Vulnerability from cvelistv5 – Published: 2021-09-14 11:15 – Updated: 2024-08-04 01:37
VLAI
EPSS
VEX
Summary
SAP Web Dispatcher versions - 7.49, 7.53, 7.77, 7.81, KRNL64NUC - 7.22, 7.22EXT, 7.49, KRNL64UC -7.22, 7.22EXT, 7.49, 7.53, KERNEL - 7.22, 7.49, 7.53, 7.77, 7.81, 7.83 processes allow an unauthenticated attacker to submit a malicious crafted request over a network to a front-end server which may, over several attempts, result in a back-end server confusing the boundaries of malicious and legitimate messages. This can result in the back-end server executing a malicious payload which can be used to read or modify any information on the server or consume server resources making it temporarily unavailable.
Severity
8.9 (High)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://wiki.scn.sap.com/wiki/pages/viewpage.acti… | x_refsource_MISC |
| https://launchpad.support.sap.com/#/notes/3080567 | x_refsource_MISC |
| http://seclists.org/fulldisclosure/2022/May/3 | mailing-listx_refsource_FULLDISC |
| http://packetstormsecurity.com/files/166964/SAP-W… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SAP SE | SAP Web Dispatcher |
Affected:
WEBDISP - 7.49
Affected: 7.53 Affected: 7.77 Affected: 7.81 Affected: KRNL64NUC - 7.22 Affected: 7.22EXT Affected: 7.49 Affected: KRNL64UC -7.22 Affected: KERNEL - 7.22 Affected: 7.83 |
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CVE-2021-37147 (GCVE-0-2021-37147)
Vulnerability from cvelistv5 – Published: 2021-11-03 15:20 – Updated: 2024-08-04 01:16
VLAI
EPSS
VEX
Title
Request Smuggling - LF line ending
Summary
Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.1.0.
Severity
No CVSS data available.
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/k01797hyncx53659w… | x_refsource_MISC |
| https://www.debian.org/security/2022/dsa-5153 | vendor-advisoryx_refsource_DEBIAN |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Traffic Server |
Affected:
8.0.0 to 8.1.2 and 9.0.0 to 9.1.0
|
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CVE-2021-34559 (GCVE-0-2021-34559)
Vulnerability from cvelistv5 – Published: 2021-08-31 10:32 – Updated: 2024-09-16 17:33
VLAI
EPSS
VEX
Title
A vulnerability in WirelessHART-Gateway <= 3.0.8 may allow remote attackers to rewrite links and URLs in cached pages to arbitrary strings
Summary
In PEPPERL+FUCHS WirelessHART-Gateway <= 3.0.8 a vulnerability may allow remote attackers to rewrite links and URLs in cached pages to arbitrary strings.
Severity
5.4 (Medium)
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://cert.vde.com/en-us/advisories/vde-2021-027 | x_refsource_CONFIRM |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Phoenix Contact | WHA-GW-F2D2-0-AS- Z2-ETH |
Affected:
3.0.8 , ≤ 3.0.8
(custom)
|
|
| Phoenix Contact | WHA-GW-F2D2-0-AS- Z2-ETH.EIP |
Affected:
3.0.8 , ≤ 3.0.8
(custom)
|
Date Public
2021-08-16 00:00
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CVE-2021-33683 (GCVE-0-2021-33683)
Vulnerability from cvelistv5 – Published: 2021-07-14 11:04 – Updated: 2024-08-03 23:58
VLAI
EPSS
VEX
Summary
SAP Web Dispatcher and Internet Communication Manager (ICM), versions - KRNL32NUC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL32UC 7.21, 7.21EXT, 7.22, 7.22EXT, KRNL64NUC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, KRNL64UC 7.21, 7.21EXT, 7.22, 7.22EXT, 7.49, 7.53, 7.73, WEBDISP 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, KERNEL 7.21, 7.22, 7.49, 7.53, 7.73, 7.77, 7.81, 7.82, 7.83, process invalid HTTP header. The incorrect handling of the invalid Transfer-Encoding header in a particular manner leads to a possibility of HTTP Request Smuggling attack. An attacker could exploit this vulnerability to bypass web application firewall protection, divert sensitive data such as customer requests, session credentials, etc.
Severity
5.4 (Medium)
CWE
- CWE-444 - (HTTP Request Smuggling)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://wiki.scn.sap.com/wiki/pages/viewpage.acti… | x_refsource_MISC |
| https://launchpad.support.sap.com/#/notes/3000663 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SAP SE | SAP Web Dispatcher and Internet Communication Manager |
Affected:
< KRNL32NUC 7.21
Affected: < 7.21EXT Affected: < 7.22 Affected: < 7.22EXT Affected: < KRNL32UC 7.21 Affected: < KRNL64NUC 7.21 Affected: < 7.49 Affected: < KRNL64UC 7.21 Affected: < 7.53 Affected: < 7.73 Affected: < WEBDISP 7.53 Affected: < 7.77 Affected: < 7.81 Affected: < 7.82 Affected: < 7.83 Affected: < KERNEL 7.21 |
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CVE-2021-33037 (GCVE-0-2021-33037)
Vulnerability from cvelistv5 – Published: 2021-07-12 14:55 – Updated: 2024-08-03 23:42
VLAI
EPSS
VEX
Title
Incorrect Transfer-Encoding handling with HTTP/1.0
Summary
Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.
Severity
No CVSS data available.
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
Assigner
References
16 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat |
Affected:
Apache Tomcat 10 10.0.0-M1 to 10.0.6
Affected: Apache Tomcat 9 9.0.0.M1 to 9.0.46 Affected: Apache Tomcat 8 8.5.0 to 8.5.66 |
Credits
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CVE-2021-32715 (GCVE-0-2021-32715)
Vulnerability from cvelistv5 – Published: 2021-07-07 20:05 – Updated: 2024-08-03 23:25
VLAI
EPSS
VEX
Title
Lenient Parsing of Content-Length Header When Prefixed with Plus Sign
Summary
hyper is an HTTP library for rust. hyper's HTTP/1 server code had a flaw that incorrectly parses and accepts requests with a `Content-Length` header with a prefixed plus sign, when it should have been rejected as illegal. This combined with an upstream HTTP proxy that doesn't parse such `Content-Length` headers, but forwards them, can result in "request smuggling" or "desync attacks". The flaw exists in all prior versions of hyper prior to 0.14.10, if built with `rustc` v1.5.0 or newer. The vulnerability is patched in hyper version 0.14.10. Two workarounds exist: One may reject requests manually that contain a plus sign prefix in the `Content-Length` header or ensure any upstream proxy handles `Content-Length` headers with a plus sign prefix.
Severity
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/hyperium/hyper/security/adviso… | x_refsource_CONFIRM |
| https://github.com/rust-lang/rust/pull/28826/comm… | x_refsource_MISC |
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CVE-2021-32565 (GCVE-0-2021-32565)
Vulnerability from cvelistv5 – Published: 2021-06-29 11:45 – Updated: 2024-08-03 23:25
VLAI
EPSS
VEX
Title
HTTP Request Smuggling, content length with invalid charters
Summary
Invalid values in the Content-Length header sent to Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1.
Severity
No CVSS data available.
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://lists.apache.org/thread.html/ra1a41ff92a7… | x_refsource_MISC |
| https://www.debian.org/security/2021/dsa-4957 | vendor-advisoryx_refsource_DEBIAN |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Traffic Server |
Affected:
Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1
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CVE-2021-27577 (GCVE-0-2021-27577)
Vulnerability from cvelistv5 – Published: 2021-06-29 11:45 – Updated: 2024-08-03 21:26
VLAI
EPSS
VEX
Title
Incorrect handling of url fragment leads to cache poisoning
Summary
Incorrect handling of url fragment vulnerability of Apache Traffic Server allows an attacker to poison the cache. This issue affects Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1.
Severity
No CVSS data available.
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://lists.apache.org/thread.html/ra1a41ff92a7… | x_refsource_MISC |
| https://www.debian.org/security/2021/dsa-4957 | vendor-advisoryx_refsource_DEBIAN |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Traffic Server |
Affected:
Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1
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CVE-2021-22960 (GCVE-0-2021-22960)
Vulnerability from cvelistv5 – Published: 2021-11-03 19:22 – Updated: 2025-04-30 22:24
VLAI
EPSS
VEX
Summary
The parse function in llhttp < 2.1.4 and < 6.0.6. ignores chunk extensions when parsing the body of chunked requests. This leads to HTTP Request Smuggling (HRS) under certain conditions.
Severity
No CVSS data available.
CWE
- CWE-444 - HTTP Request Smuggling (CWE-444)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://hackerone.com/reports/1238099 | x_refsource_MISC |
| https://www.oracle.com/security-alerts/cpujan2022.html | x_refsource_MISC |
| https://www.debian.org/security/2022/dsa-5170 | vendor-advisoryx_refsource_DEBIAN |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| NodeJS | Node |
Affected:
4.0 , < 4.*
(semver)
Affected: 5.0 , < 5.* (semver) Affected: 6.0 , < 6.* (semver) Affected: 7.0 , < 7.* (semver) Affected: 8.0 , < 8.* (semver) Affected: 9.0 , < 9.* (semver) Affected: 10.0 , < 10.* (semver) Affected: 11.0 , < 11.* (semver) Affected: 12.0 , < 12.22.7 (semver) Affected: 13.0 , < 13.* (semver) Affected: 14.0 , < 14.18.1 (semver) Affected: 15.0 , < 15.* (semver) Affected: 16.0 , < 16.11.1 (semver) |
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CVE-2021-22959 (GCVE-0-2021-22959)
Vulnerability from cvelistv5 – Published: 2021-11-15 14:45 – Updated: 2025-04-30 22:24
VLAI
EPSS
VEX
Summary
The parser in accepts requests with a space (SP) right after the header name before the colon. This can lead to HTTP Request Smuggling (HRS) in llhttp < v2.1.4 and < v6.0.6.
Severity
No CVSS data available.
CWE
- CWE-444 - HTTP Request Smuggling (CWE-444)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://hackerone.com/reports/1238709 | x_refsource_MISC |
| https://www.oracle.com/security-alerts/cpujan2022.html | x_refsource_MISC |
| https://www.debian.org/security/2022/dsa-5170 | vendor-advisoryx_refsource_DEBIAN |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| NodeJS | Node |
Affected:
4.0 , < 4.*
(semver)
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"value": "The parser in accepts requests with a space (SP) right after the header name before the colon. This can lead to HTTP Request Smuggling (HRS) in llhttp \u003c v2.1.4 and \u003c v6.0.6."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "HTTP Request Smuggling (CWE-444)"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://hackerone.com/reports/1238709",
"refsource": "MISC",
"url": "https://hackerone.com/reports/1238709"
},
{
"name": "https://www.oracle.com/security-alerts/cpujan2022.html",
"refsource": "MISC",
"url": "https://www.oracle.com/security-alerts/cpujan2022.html"
},
{
"name": "DSA-5170",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2022/dsa-5170"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"assignerShortName": "hackerone",
"cveId": "CVE-2021-22959",
"datePublished": "2021-11-15T14:45:16.000Z",
"dateReserved": "2021-01-06T00:00:00.000Z",
"dateUpdated": "2025-04-30T22:24:37.284Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
Mitigation
Implementation
Use a web server that employs a strict HTTP parsing procedure, such as Apache [REF-433].
Mitigation
Implementation
Use only SSL communication.
Mitigation
Implementation
Terminate the client session after each request.
Mitigation
System Configuration
Turn all pages to non-cacheable.
CAPEC-273: HTTP Response Smuggling
An adversary manipulates and injects malicious content in the form of secret unauthorized HTTP responses, into a single HTTP response from a vulnerable or compromised back-end HTTP agent (e.g., server).
See CanPrecede relationships for possible consequences.
CAPEC-33: HTTP Request Smuggling
An adversary abuses the flexibility and discrepancies in the parsing and interpretation of HTTP Request messages using various HTTP headers, request-line and body parameters as well as message sizes (denoted by the end of message signaled by a given HTTP header) by different intermediary HTTP agents (e.g., load balancer, reverse proxy, web caching proxies, application firewalls, etc.) to secretly send unauthorized and malicious HTTP requests to a back-end HTTP agent (e.g., web server).
See CanPrecede relationships for possible consequences.