8.8

CVE-2021-33621: fedoraproject fedora Injection

CVSS: 8.8v3.1HighModified
AliasesALPINE-CVE-2021-33621MGASA-2022-0454RHSA-2024:4542
Published 18-11-2022Last modified 04-11-2025
Open JSON

Vulnerability summary

CVE-2021-33621 is a high (CVSS 8.8) Injection vulnerability in fedoraproject fedora. EPSS estimates a 2.44% chance of exploitation in the next 30 days, higher than 84% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
46/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
2.44%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 10 · Related 3
DLA-3450-1DLA-3858-1RHSA-2023:3291RHSA-2023:3821RHSA-2023:7025RHSA-2024:1431

Timeline

  1. 18-11-2022
    PublishedVulnerability first disclosed.
  2. 04-11-2025
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

2.44%

Chance of exploitation in the next 30 days

Percentile

84%

Versus all other CVEs

30-day change

0.00 pp

From 2.44% on 19-09-2026

19-09-202619-10-2026
EPSS score
2.44%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (ruby-lang.org)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Redhat29 products
  • ruby< 0:3.0.4-161.el9_2.1
  • ruby-debuginfo< 0:3.0.4-161.el9_2.1
  • ruby-debugsource< 0:3.0.4-161.el9_2.1
  • ruby-default-gems< 0:3.0.4-161.el9_2.1
  • ruby-devel< 0:3.0.4-161.el9_2.1
Ubuntu5 products
  • jrubyAll versions (No fix recorded)
  • ruby2.3< 2.3.1-2~ubuntu16.04.16+esm4
  • ruby2.5< 2.5.1-1ubuntu1.13
  • ruby2.7< 2.7.0-5ubuntu1.8
  • ruby3.0< 3.0.2-7ubuntu2.3
Ruby-lang2 products
  • cgi< 0.1.0.2 | ≥ 0.2.0, < 0.2.2 | ≥ 0.3.0, < 0.3.5
  • ruby≥ 2.7.0, < 2.7.7 | ≥ 3.0.0, < 3.0.5 | ≥ 3.1.0, < 3.1.3
Alpine1 product
  • ruby≥ 2.7.0, < 2.7.7-r0 | ≥ 2.7.0, < 3.0.5-r0 | ≥ 2.7.0, < 3.1.3-r0
Debian1 product
  • ruby3.1< 3.1.2-4
Fedoraproject1 product
Mageia1 product
  • ruby< 2.7.7-33.6.mga8
Opensuse1 product
  • ruby3.1&distro=openSUSE Tumbleweed< 3.1.3-1.1
RubyGems1 product
  • cgi≥ 0.3.0, < 0.3.5 | ≥ 0.2.0, < 0.2.2 | < 0.1.0.2

9 vendors · 42 products

References

39 links
Show all 39 references