CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

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.

CVE-2025-55018 (GCVE-0-2025-55018)

Vulnerability from cvelistv5 – Published: 2026-02-10 15:39 – Updated: 2026-05-12 12:08
VLAI
Summary
An inconsistent interpretation of http requests ('http request smuggling') vulnerability in Fortinet FortiOS 7.6.0, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4.3 through 6.4.16 may allow an unauthenticated attacker to smuggle an unlogged http request through the firewall policies via a specially crafted header
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-444 - Execute unauthorized code or commands
Assigner
Impacted products
Vendor Product Version
Fortinet FortiOS Affected: 7.6.0
Affected: 7.4.0 , ≤ 7.4.9 (semver)
Affected: 7.2.0 , ≤ 7.2.13 (semver)
Affected: 7.0.0 , ≤ 7.0.19 (semver)
Affected: 6.4.3 , ≤ 6.4.16 (semver)
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    cpe:2.3:o:fortinet:fortios:7.4.7:*:*:*:*:*:*:*
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    cpe:2.3:o:fortinet:fortios:7.4.5:*:*:*:*:*:*:*
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Create a notification for this product.
Siemens RUGGEDCOM APE1808 Affected: 0 , < * (custom)
Create a notification for this product.
Show details on NVD website

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CVE-2025-55315 (GCVE-0-2025-55315)

Vulnerability from cvelistv5 – Published: 2025-10-14 17:00 – Updated: 2026-02-22 17:24
VLAI
Title
ASP.NET Security Feature Bypass Vulnerability
Summary
Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an authorized attacker to bypass a security feature over a network.
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
Date Public
2025-10-14 14:00
Show details on NVD website

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CVE-2025-58056 (GCVE-0-2025-58056)

Vulnerability from cvelistv5 – Published: 2025-09-03 20:56 – Updated: 2025-09-05 18:41
VLAI
Title
Netty is vulnerable to request smuggling due to incorrect parsing of chunk extensions
Summary
Netty is an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients. In versions 4.1.124.Final, and 4.2.0.Alpha3 through 4.2.4.Final, Netty incorrectly accepts standalone newline characters (LF) as a chunk-size line terminator, regardless of a preceding carriage return (CR), instead of requiring CRLF per HTTP/1.1 standards. When combined with reverse proxies that parse LF differently (treating it as part of the chunk extension), attackers can craft requests that the proxy sees as one request but Netty processes as two, enabling request smuggling attacks. This is fixed in versions 4.1.125.Final and 4.2.5.Final.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
Impacted products
Vendor Product Version
netty netty Affected: >= 4.2.0.Alpha3, < 4.2.5.Final
Affected: <= 4.1.124.Final, < 4.1.125.Final
Create a notification for this product.
Show details on NVD website

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CVE-2025-58068 (GCVE-0-2025-58068)

Vulnerability from cvelistv5 – Published: 2025-08-29 21:12 – Updated: 2025-11-03 18:13
VLAI
Title
Eventlet affected by HTTP request smuggling in unparsed trailers
Summary
Eventlet is a concurrent networking library for Python. Prior to version 0.40.3, the Eventlet WSGI parser is vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer sections. This vulnerability could enable attackers to, bypass front-end security controls, launch targeted attacks against active site users, and poison web caches. This problem has been patched in Eventlet 0.40.3 by dropping trailers which is a breaking change if a backend behind eventlet.wsgi proxy requires trailers. A workaround involves not using eventlet.wsgi facing untrusted clients.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
Impacted products
Vendor Product Version
eventlet eventlet Affected: < 0.40.3
Create a notification for this product.
Show details on NVD website

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CVE-2025-59822 (GCVE-0-2025-59822)

Vulnerability from cvelistv5 – Published: 2025-09-23 18:54 – Updated: 2025-09-23 19:17
VLAI
Title
Http4s vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section
Summary
Http4s is a Scala interface for HTTP services. In versions from 1.0.0-M1 to before 1.0.0-M45 and before 0.23.31, http4s is vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section. This vulnerability could enable attackers to bypass front-end servers security controls, launch targeted attacks against active users, and poison web caches. A pre-requisite for exploitation involves the web application being deployed behind a reverse-proxy that forwards trailer headers. This issue has been patched in versions 1.0.0-M45 and 0.23.31.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
Vendor Product Version
http4s http4s Affected: < 0.23.31
Affected: >= 1.0.0-M1, < 1.0.0-M45
Create a notification for this product.
Show details on NVD website

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CVE-2025-6442 (GCVE-0-2025-6442)

Vulnerability from cvelistv5 – Published: 2025-06-25 16:52 – Updated: 2025-06-25 20:42
VLAI
Title
Ruby WEBrick read_header HTTP Request Smuggling Vulnerability
Summary
Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions. The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
zdi
References
Impacted products
Vendor Product Version
Ruby WEBrick Affected: 1.8.1
Create a notification for this product.
Date Public
2025-06-23 14:00
Show details on NVD website

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CVE-2025-65114 (GCVE-0-2025-65114)

Vulnerability from cvelistv5 – Published: 2026-04-02 15:55 – Updated: 2026-04-02 18:10
VLAI
Title
Apache Traffic Server: Malformed chunked message body allows request smuggling
Summary
Apache Traffic Server allows request smuggling if chunked messages are malformed.  This issue affects Apache Traffic Server: from 9.0.0 through 9.2.12, from 10.0.0 through 10.1.1. Users are recommended to upgrade to version 9.2.13 or 10.1.2, which fix the issue.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache Traffic Server Affected: 9.0.0 , ≤ 9.2.12 (semver)
Affected: 10.0.0 , ≤ 10.1.1 (semver)
Create a notification for this product.
Credits
Katsutoshi Ikenoya
Show details on NVD website

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CVE-2025-69224 (GCVE-0-2025-69224)

Vulnerability from cvelistv5 – Published: 2026-01-05 22:35 – Updated: 2026-01-06 19:03
VLAI
Title
AIOHTTP's Unicode processing of header values could cause parsing discrepancies
Summary
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below of the Python HTTP parser may allow a request smuggling attack with the presence of non-ASCII characters. If a pure Python version of AIOHTTP is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. This issue is fixed in version 3.13.3.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
Vendor Product Version
aio-libs aiohttp Affected: < 3.13.3
Create a notification for this product.
Show details on NVD website

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CVE-2025-69225 (GCVE-0-2025-69225)

Vulnerability from cvelistv5 – Published: 2026-01-05 23:16 – Updated: 2026-01-06 19:02
VLAI
Title
AIOHTTP Regex Mismatch Allows Unicode in ASCII-Only Protocol Fields
Summary
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below contain parser logic which allows non-ASCII decimals to be present in the Range header. There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. This issue is fixed in version 3.13.3.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
Vendor Product Version
aio-libs aiohttp Affected: < 3.13.3
Create a notification for this product.
Show details on NVD website

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CVE-2025-6999 (GCVE-0-2025-6999)

Vulnerability from cvelistv5 – Published: 2025-09-15 21:17 – Updated: 2025-09-16 15:41
VLAI
Title
WatchGuard Firebox Authentication Portal Request Smuggling Vulnerability
Summary
An HTTP Request Smuggling [CWE-444] vulnerability in the Authentication portal of WatchGuard Fireware OS allows a remote attacker to evade request parameter sanitation and perform a reflected self-Cross-Site Scripting (XSS) attack.This issue affects Fireware OS: from 12.0 through 12.11.2.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
Impacted products
Vendor Product Version
WatchGuard Fireware OS Affected: 12.0 , ≤ 12.11.2 (semver)
Create a notification for this product.
Show details on NVD website

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          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-444",
              "description": "CWE-444 Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-15T21:17:51.424Z",
        "orgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3",
        "shortName": "WatchGuard"
      },
      "references": [
        {
          "url": "https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00014"
        }
      ],
      "source": {
        "advisory": "WGSA-2025-00014",
        "defect": [
          "FBX-28178"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "WatchGuard Firebox Authentication Portal Request Smuggling Vulnerability",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "5d1c2695-1a31-4499-88ae-e847036fd7e3",
    "assignerShortName": "WatchGuard",
    "cveId": "CVE-2025-6999",
    "datePublished": "2025-09-15T21:17:51.424Z",
    "dateReserved": "2025-07-02T00:11:51.723Z",
    "dateUpdated": "2025-09-16T15:41:45.704Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

Mitigation

Phase: Implementation

Description:

  • Use a web server that employs a strict HTTP parsing procedure, such as Apache [REF-433].
Mitigation

Phase: Implementation

Description:

  • Use only SSL communication.
Mitigation

Phase: Implementation

Description:

  • Terminate the client session after each request.
Mitigation

Phase: System Configuration

Description:

  • 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.']

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