CVE-2021-33621 is an HTTP response splitting vulnerability affecting the CGI gem for Ruby, specifically versions before 0.1.0.2, 0.2.2, and 0.3.5, impacting applications that process untrusted user input. With a CVSS score of 8.8 (HIGH), it allows an attacker to inject malicious content into HTTP responses, potentially leading to data compromise, integrity issues, and denial of service. While no active exploits or public exploit code (Metasploit, Nuclei, ExploitDB) are reported, it has garnered some community discussion and media coverage, indicating awareness within the cybersecurity community.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 0.1.0.2CPE matchmatch criteria | cpe:2.3:a:ruby-lang:cgi:*:*:*:*:*:ruby:*:* | ||
>= 0.2.0, < 0.2.2CPE matchmatch criteria | cpe:2.3:a:ruby-lang:cgi:*:*:*:*:*:ruby:*:* | ||
>= 0.3.0, < 0.3.5CPE matchmatch criteria | cpe:2.3:a:ruby-lang:cgi:*:*:*:*:*:ruby:*:* | ||
35CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* | ||
36CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.