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CVE-2025-27220

Good to know:

Date: March 2, 2025

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

Severity Score

4.0

Related Resources (11)

Url: https://github.com/ruby/cgi/pull/54

Url: https://github.com/ruby/cgi/pull/53

Url: https://github.com/ruby/cgi/pull/52

Url: https://www.cve.org/CVERecord?id=CVE-2025-27220

Url: https://github.com/ruby/cgi

Url: https://nvd.nist.gov/vuln/detail/CVE-2025-27220

Url: https://hackerone.com/reports/2890322

Url: https://github.com/rubysec/ruby-advisory-db/blob/master/gems/cgi/CVE-2025-27220.yml

Url: https://security-tracker.debian.org/tracker/CVE-2025-27220

Url: https://www.ruby-lang.org/en/news/2025/02/26/security-advisories

Url: https://www.mend.io/vulnerability-database/CVE-2025-27220

Severity Score

4.0

Weakness Type (CWE)

Inefficient Regular Expression Complexity

CWE-1333

Top Fix

Upgrade Version

Upgrade to version cgi - 0.3.7;cgi - 0.3.5.1;cgi - 0.4.2

CVSS v3.1

Base Score:	4.0
Attack Vector (AV):	NETWORK
Attack Complexity (AC):	HIGH
Privileges Required (PR):	NONE
User Interaction (UI):	NONE
Scope (S):	CHANGED
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	LOW

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