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Medium severity · published May 19, 2025
CVE-2025-23167
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`
6.5
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NO
node · nodejs
4.0 before 4.*; 5.0 before 5.*; 6.0 before 6.*; 7.0 before 7.*; 8.0 before 8.*; 9.0 before 9.*; +11 more · source: vendor
Affected product
NO
node
nodejs
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-23167
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-23167
nodejs.org
https://nodejs.org/en/blog/vulnerability/may-2025-security-releases
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