PoC Index

CVE-2025-23167

MEDIUM 6.5EPSS 0.5%

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.

CVSS v3.0
6.5 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS
0.51% chance of exploitation in the next 30 days, 41th percentile
Published
2025-05-19
Updated
2025-05-27

Proof-of-concept exploits (1)

References

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