CVE-2025-27219

Name: CVE-2025-27219
Creator: NVD / NIST
Published: 2025-03-04T00:15:31.55+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.78%

Last modified Jun 17, 2026

CVE-2025-27219 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In the CGI gem before 0.4.2 for Ruby, the CGI::Cookie.parse method in the CGI library contains a potential Denial of Service (DoS) vulnerability. The method does not impose any limit on the length of the raw cookie value it processes. EPSS estimates a 0.78% chance of exploitation in the next 30 days.

Description

In the CGI gem before 0.4.2 for Ruby, the CGI::Cookie.parse method in the CGI library contains a potential Denial of Service (DoS) vulnerability. The method does not impose any limit on the length of the raw cookie value it processes. This oversight can lead to excessive resource consumption when parsing extremely large cookies.

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

0.78%

51.4th 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-2025-27219.ymlThird Party Advisory
https://hackerone.com/reports/2936778Permissions 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-2025-27219?

How severe is CVE-2025-27219?

CVE-2025-27219 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.78% probability of exploitation in the next 30 days.

How do I fix CVE-2025-27219?

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-2025-27219?

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

Scan your code now

Source: NVD / NIST