Home/CVE/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
CVE

CVE-2021-33621

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

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.

HIGH · CVSS 8.8 EPSS 0.01371
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules3 YARA rules0

Affected Products & Versions

7
ruby-lang cgi< 0.1.0.2
ruby-lang cgi>= 0.2.0 and < 0.2.2
ruby-lang cgi>= 0.3.0 and < 0.3.5
ruby-lang ruby>= 2.7.0 and < 2.7.7
ruby-lang ruby>= 3.0.0 and < 3.0.5
ruby-lang ruby>= 3.1.0 and < 3.1.3

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
RubyGems cgi HIGH fixed in 0.3.5

Public Exploits & PoCs

1

Sigma Hunt Rules

3
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumRuby on Rails Framework Exceptions
productmediumPotential Ruby Reverse Shell
productmediumRuby Inline Command Execution

Scoring & Timeline

8.8
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD18 Nov 2022 · 11:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Advisories

14
suse-csafopenSUSE-SU-2024:12539-1
rhsaRHSA-2024:3838Moderate
rhsaRHSA-2024:3500Moderate
suse-csafSUSE-SU-2023:4176-1
rhsaRHSA-2024:1431Moderate
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