CVE-2025-25200
CRITICAL EPSS 51.0%
Published Feb 12, 20251y ago · Modified Jun 17, 20261w ago
9.2 CVSS 4.0
Published Feb 12, 2025 1y ago
Last Modified Jun 17, 2026 1w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
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/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 Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
51.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available
Weaknesses 1
CWE-1333
Affected Products 6
References 7
- github.com https://github.com/koajs/koa/blob/master/lib/request.js#L259
- github.com https://github.com/koajs/koa/blob/master/lib/request.js#L404
- github.com https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c
- github.com https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32
- github.com https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08
- github.com https://github.com/koajs/koa/releases/tag/2.15.4
- github.com https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m
Remediation
- github.com https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c
- github.com https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32
- github.com https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08