Koa is expressive middleware for Node.js using ES2017 async functions. Prior to versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3, Koa uses an evil regex to parse the `X-Forwarded-Proto` and `X-Forwarded-Host` HTTP headers. This can be exploited to carry out a Denial-of-Service attack. Versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3 fix the issue.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact High

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

No data.

No data.

No data.

References
Link Providers
https://github.com/koajs/koa/blob/master/lib/request.js#L259 cve-icon cve-icon cve-icon
https://github.com/koajs/koa/blob/master/lib/request.js#L404 cve-icon cve-icon cve-icon
https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c cve-icon cve-icon cve-icon
https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32 cve-icon cve-icon cve-icon
https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08 cve-icon cve-icon cve-icon
https://github.com/koajs/koa/releases/tag/2.15.4 cve-icon cve-icon cve-icon
https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-25200 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-25200 cve-icon
History

Sat, 22 Feb 2025 02:45:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Important

 cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

threat_severity

Low

Fri, 21 Feb 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics threat_severity

Critical

 cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Important

Fri, 21 Feb 2025 02:00:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Critical

Wed, 12 Feb 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 12 Feb 2025 18:15:00 +0000

Type Values Removed Values Added
Description Koa is expressive middleware for Node.js using ES2017 async functions. Prior to versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3, Koa uses an evil regex to parse the `X-Forwarded-Proto` and `X-Forwarded-Host` HTTP headers. This can be exploited to carry out a Denial-of-Service attack. Versions 0.21.2, 1.7.1, 2.15.4, and 3.0.0-alpha.3 fix the issue.
Title Koa has Inefficient Regular Expression Complexity
Weaknesses CWE-1333
References
Metrics cvssV4_0

{'score': 9.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H'}
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2025-02-12T17:59:04.615Z

Updated: 2025-02-12T19:29:10.232Z

Reserved: 2025-02-03T19:30:53.400Z

Link: CVE-2025-25200

cve-icon Vulnrichment

Updated: 2025-02-12T19:29:02.600Z

cve-icon NVD

Status : Received

Published: 2025-02-12T18:15:28.110

Modified: 2025-02-12T18:15:28.110

Link: CVE-2025-25200

cve-icon Redhat

Severity : Low

Publid Date: 2025-02-12T17:59:04Z

Links: CVE-2025-25200 - Bugzilla