CVE-2021-33621: Fedoraproject Fedora

High severity, CVSS 8.8. EPSS: 2.4% chance of exploitation in the next 30 days.

The cgi gem before 0.1.0.2, 0.2.x before 0.2.2, and 0.3.x before 0.3.5 for Ruby allows HTTP response splitting. This is relevant to applications that use untrusted user input either to generate an HTTP response or to create a CGI::Cookie object.

Affected products

• Fedoraproject Fedora: version 35 only; version 36 only; version 37 only
• Ruby-Lang Cgi: before 0.1.0.2 (fixed in 0.1.0.2); from 0.2.0, before 0.2.2 (fixed in 0.2.2); from 0.3.0, before 0.3.5 (fixed in 0.3.5)
• Ruby-Lang Ruby: from 2.7.0, before 2.7.7 (fixed in 2.7.7); from 3.0.0, before 3.0.5 (fixed in 3.0.5); from 3.1.0, before 3.1.3 (fixed in 3.1.3)

Published 2022-11-18. Last modified 2026-06-17.