Vulnerability-Lookup

GHSA-FVX8-Q97Q-CW73

Vulnerability from github – Published: 2025-11-03 21:34 – Updated: 2025-11-12 15:31

Details

lighttpd1.4.80 incorrectly merged trailer fields into headers after http request parsing. This behavior can be exploited to conduct HTTP Header Smuggling attacks.

Successful exploitation may allow an attacker to:

Bypass access control rules
Inject unsafe input into backend logic that trusts request headers
Execute HTTP Request Smuggling attacks under some conditions

This issue affects lighttpd1.4.80

Severity

9.1 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

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{
  "affected": [],
  "aliases": [
    "CVE-2025-12642"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-11-03T20:17:06Z",
    "severity": "MODERATE"
  },
  "details": "lighttpd1.4.80 incorrectly merged trailer fields into headers\u00a0after http request parsing. This behavior can be exploited to conduct HTTP Header Smuggling attacks.\n\nSuccessful exploitation may allow an attacker to:\n\n  *  Bypass access control rules\n  *  Inject unsafe input into backend logic that trusts request headers\n  *  Execute HTTP Request Smuggling attacks under some conditions\n\n\nThis issue affects lighttpd1.4.80",
  "id": "GHSA-fvx8-q97q-cw73",
  "modified": "2025-11-12T15:31:28Z",
  "published": "2025-11-03T21:34:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-12642"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lighttpd/lighttpd1.4/commit/35cb89c103877de62d6b63d0804255475d77e5e1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/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"
    }
  ]
}

CVE-2025-12642 (GCVE-0-2025-12642)

Vulnerability from cvelistv5 – Published: 2025-11-03 19:36 – Updated: 2025-11-03 19:44

Title

HTTP Header Smuggling via Trailer Merge

Summary

lighttpd1.4.80 incorrectly merged trailer fields into headers after http request parsing. This behavior can be exploited to conduct HTTP Header Smuggling attacks. Successful exploitation may allow an attacker to: * Bypass access control rules * Inject unsafe input into backend logic that trusts request headers * Execute HTTP Request Smuggling attacks under some conditions This issue affects lighttpd1.4.80

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

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

Toreon

References

1 reference

URL	Tags
https://github.com/lighttpd/lighttpd1.4/commit/35…

Impacted products

1 product

Vendor	Product	Version
lighttpd	lighttpd	Affected: 1.4.80 , < 1.4.81 (custom)

Credits

Sebastiano Sartor <@sebsrt>

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-FVX8-Q97Q-CW73

CVE-2025-12642 (GCVE-0-2025-12642)

Tags

Sightings

Nomenclature