VULNERABILITY INTELLIGENCE

CVE-2021-22960

CVSS score6.5 MEDIUM

EPSS probability2.47%

CISA KEVNot currently listed

Published2021-11-03

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Description

The parse function in llhttp < 2.1.4 and < 6.0.6. ignores chunk extensions when parsing the body of chunked requests. This leads to HTTP Request Smuggling (HRS) under certain conditions.

Weakness classification

support@hackerone.com: CWE-444
nvd@nist.gov: CWE-444

Primary references

support@hackerone.com — Exploit, Issue Tracking, Third Party Advisory
support@hackerone.com — Third Party Advisory
support@hackerone.com — Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Patch, Third Party Advisory