CVE-2025-27220 — Regex Denial of Service in CGI

CWE-1333 — Regex Denial of Service11 documents8 sources
Severity
7.5HIGHNVD
CNA4.0OSV6.6
EPSS
0.2%
top 60.15%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
Ruby-lang CGI
Timeline
PublishedMar 4
Latest updateApr 17

Description

In the CGI gem before 0.4.2 for Ruby, a Regular Expression Denial of Service (ReDoS) vulnerability exists in the Util#escapeElement method.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages3 packages

▶CVEListV5ruby-lang/cgi0.3.6 — 0.3.7+2
▶NVDruby-lang/cgi0.4.0 — 0.4.2+2
▶RubyGemsruby-lang/cgi0.3.6 — 0.3.7+2

🔴Vulnerability Details

5
OSV
ruby2.3, ruby2.5 vulnerabilities↗2025-04-17
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OSV
CVE-2025-27220: In the CGI gem before 0↗2025-03-04
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CVEList
CVE-2025-27220: In the CGI gem before 0↗2025-03-03
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GHSA
CGI has Regular Expression Denial of Service (ReDoS) potential in Util#escapeElement↗2025-03-03
▶
OSV
CGI has Regular Expression Denial of Service (ReDoS) potential in Util#escapeElement↗2025-03-03
▶

📋Vendor Advisories

5
Ubuntu
Ruby vulnerabilities↗2025-04-17
▶
Ubuntu
Ruby vulnerabilities↗2025-04-07
▶
Microsoft
In the CGI gem before 0.4.2 for Ruby, a Regular Expression Denial of Service (ReDoS) vulnerability exists in the Util#escapeElement method.↗2025-03-11
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Red Hat
CGI: ReDoS in CGI::Util#escapeElement↗2025-03-03
▶
Debian
CVE-2025-27220: ruby2.7 - In the CGI gem before 0.4.2 for Ruby, a Regular Expression Denial of Service (Re...↗2025
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CVE-2025-27220 — Regex Denial of Service in CGI | cvebase