CVE-2025-23167

mediumpriority · track · 10EPSS 0.005 · 43 %ileexploit · PoCDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

0.51% (43rd) EPSS

CVSS 6.5 · medium

Is it mine?

42 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-26

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

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.06.5mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Nsecondary · ENISA EU

v3.06.5mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Nsecondary · support@hackerone.comexploitability 3.9 · impact 2.5

v3.16.5mediumAV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:Nsecondary · FSTEC (BDU) RU

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-444USCWE-444US

exploits (1)

Public proof-of-concept and weaponised exploit code.

abhisek3122/CVE-2025-23167Working exploit for CVE-2025-23167 – HTTP request smuggling in vulnerable Node.js 20.x versions before 20.19.2PoC · poc_in_github

affected products (42)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Dell Data Protection Advisorall versionscert_bundDEcpe:/a:dell:data_protection_advisor:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Hitachi Ops Centerall versionscert_bundDEcpe:/a:hitachi:ops_center:-
IBM App Connect Enterpriseall versionscert_bundDEcpe:/a:ibm:app_connect_enterprise:-
IBM Business Automation Workflowall versionscert_bundDEcpe:/a:ibm:business_automation_workflow:-
Open Source Arch Linuxall versionscert_bundDEcpe:/o:archlinux:archlinux:-
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
IBM App Connect Enterprise< 12.14.0cert_bundDE
IBM App Connect Enterprise< LTS 12.0.14cert_bundDE
Open Source Node.js< v20.19.2cert_bundDE
Open Source Node.js< v22.15.1cert_bundDE
Open Source Node.js< v23.11.1cert_bundDE
Open Source Node.js< v24.0.2cert_bundDE
Splunk Splunk Enterprise< 10.0.3cert_bundDE
Splunk Splunk Enterprise< 10.2.0cert_bundDE
Splunk Splunk Enterprise< 9.2.12cert_bundDE
Splunk Splunk Enterprise< 9.3.9cert_bundDE

showing 20 of 42

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-1055Node.js: Mehrere SchwachstellenDeutsch2025-05-14csaf · cert_bundDE
Ein lokaler Angreifer kann mehrere Schwachstellen in Node.js ausnutzen, um einen Denial of Service Angriff durchzuführen oder Sicherheitsvorkehrungen zu umgehen.
BIT-node-2025-231672025-05-21vendor · osvUS
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.
BIT-node-min-2025-231672025-05-21vendor · osvUS
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.

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv cert_bund NVD CVE.org MITRE

published 2025-05-19modified 2026-06-17

references (5)

External citations — patches, advisories, analysis.

scry

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