CVE-2025-23167
6.5
MEDIUM
CVSS 3.1
EPSS 0.10%
Description
A flaw in Node.js 20's HTTP parser allows improper termination of HTTP/1 headers using `\r\n\rX` instead of the required `\r\n\r\n`. This inconsistency enables request smuggling, allowing attackers to bypass proxy-based access controls and submit unauthorized requests. The issue was resolved by upgrading `llhttp` to version 9, which enforces correct header termination. Impact: * This vulnerability affects only Node.js 20.x users prior to the `llhttp` v9 upgrade.
How to fix CVE-2025-23167
To remediate CVE-2025-23167, upgrade the affected package to a fixed version below.
- —upgrade to 20.19.2 or later
- —upgrade to 20.19.2 or later
- —no fix listed
Is CVE-2025-23167 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 20.19.2
- from 0, < 20.19.2
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |