What’s Vulnerable › Vulnerabilities

CVE-2021-22960

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-11-03 · updated 2026-06-17
• Weakness: CWE-444

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.

Affected products

• Debian Linux: 11.0
• Llhttp: before 2.1.4; from 3.0.0 before 6.0.6 — fixed in 2.1.4, 6.0.6
• Oracle Corporation GraalVM Enterprise Edition: 20.3.4, 21.3.0

How to fix

Upgrade to a fixed version: Llhttp 2.1.4, 6.0.6. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/1238099
• https://www.debian.org/security/2022/dsa-5170
• https://www.oracle.com/security-alerts/cpujan2022.html
• https://hackerone.com/reports/1238099
• https://www.debian.org/security/2022/dsa-5170
• https://www.oracle.com/security-alerts/cpujan2022.html

Get alerted when CVE-2021-22960 or the next vulnerability affects your stack