CVE-2025-25200

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-25200
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.

7.5 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/koajs/koa/blob/master/lib/request.js#L259 Product
https://github.com/koajs/koa/blob/master/lib/request.js#L404 Product
https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c Patch
https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32 Patch
https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08 Patch
https://github.com/koajs/koa/releases/tag/2.15.4 Release Notes
https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:3.0.0:alpha0:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:3.0.0:alpha1:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:3.0.0:alpha2:*:*:*:node.js:*:*
History

20 Jan 2026, 14:42

Type Values Removed Values Added
CPE cpe:2.3:a:koajs:koa:3.0.0:alpha0:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:3.0.0:alpha1:*:*:*:node.js:*:*
cpe:2.3:a:koajs:koa:3.0.0:alpha2:*:*:*:node.js:*:*
References () https://github.com/koajs/koa/blob/master/lib/request.js#L259 - () https://github.com/koajs/koa/blob/master/lib/request.js#L259 - Product
References () https://github.com/koajs/koa/blob/master/lib/request.js#L404 - () https://github.com/koajs/koa/blob/master/lib/request.js#L404 - Product
References () https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c - () https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c - Patch
References () https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32 - () https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32 - Patch
References () https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08 - () https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08 - Patch
References () https://github.com/koajs/koa/releases/tag/2.15.4 - () https://github.com/koajs/koa/releases/tag/2.15.4 - Release Notes
References () https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m - () https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m - Vendor Advisory
First Time Koajs koa
Koajs
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.5
Summary
  • (es) Koa es un middleware expresivo para Node.js que utiliza funciones asincrónicas ES2017. En versiones anteriores a las 0.21.2, 1.7.1, 2.15.4 y 3.0.0-alpha.3, Koa utiliza una expresión regular maliciosa para analizar los encabezados HTTP `X-Forwarded-Proto` y `X-Forwarded-Host`. Esto se puede aprovechar para llevar a cabo un ataque de denegación de servicio. Las versiones 0.21.2, 1.7.1, 2.15.4 y 3.0.0-alpha.3 solucionan el problema.

12 Feb 2025, 18:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-12 18:15

Updated : 2026-01-20 14:42

NVD link : CVE-2025-25200

Mitre link : CVE-2025-25200

CVE.ORG link : CVE-2025-25200

JSON object : View

Products Affected

koajs

  • koa
CWE
CWE-1333

Inefficient Regular Expression Complexity