VulnerabilityAnalyzed
CVE-2025-25200
This can be exploited to carry out a Denial-of-Service attack.
CRITICAL 9.2EPSS 0.84%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.84%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 4.0
- 9.2 CRITICALCVSS: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/M
- EPSS
- 0.84% probability · 56th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-1333
- Affected
- koajs/koa
- Source
- security-advisories@github.com
References
- https://github.com/koajs/koa/blob/master/lib/request.js#L259Product
- https://github.com/koajs/koa/blob/master/lib/request.js#L404Product
- https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83cPatch
- https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32Patch
- https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08Patch
- https://github.com/koajs/koa/releases/tag/2.15.4Release Notes
- https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5mVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.