CVE-2025-27220

Name: CVE-2025-27220
Creator: NVD / NIST
Published: 2025-03-04T00:15:31.693+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.70%

Last modified Jun 17, 2026

CVE-2025-27220 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In the CGI gem before 0.4.2 for Ruby, a Regular Expression Denial of Service (ReDoS) vulnerability exists in the Util#escapeElement method.. EPSS estimates a 0.70% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.70%

48.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Ruby-Lang	Cgi	< 0.3.5.1
Ruby-Lang	Cgi	>= 0.4.0, < 0.4.2
Ruby-Lang	Cgi	0.3.6

References

https://github.com/rubysec/ruby-advisory-db/blob/master/gems/cgi/CVE-2025-27220.ymlThird Party Advisory
https://hackerone.com/reports/2890322Permissions Required
https://lists.debian.org/debian-lts-announce/2025/03/msg00008.html

Timeline

Published: Mar 4, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-27220?

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

How severe is CVE-2025-27220?

CVE-2025-27220 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.

How do I fix CVE-2025-27220?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-27220?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST