CVE-2021-22959 Other in Node

What is CVE-2021-22959?

CVE-2021-22959 is a medium-severity vulnerability in Debian Debian Linux, published on 15 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The parser in accepts requests with a space (SP) right after the header name before the colon. This can lead to HTTP Request Smuggling (HRS) in llhttp < v2.1.4 and < v6.0.6.

Weakness: CWE-444

Which versions are affected by CVE-2021-22959?

It affects 3 products.

Products include Debian Debian Linux, Llhttp Llhttp, Oracle Graalvm.

How do I fix CVE-2021-22959?

Upgrade to a fixed version.

Is CVE-2021-22959 being exploited?

There is no known exploitation of CVE-2021-22959 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2021-22959, CLEANSTART-2026-RW51296, CLEANSTART-2026-UX71559, DEBIAN-CVE-2021-22959, GHSA-mhxq-vjjq-pcvf, openSUSE-SU-2024:12237-1.