CVE-2021-36125

Name: CVE-2021-36125
Creator: NVD / NIST
Published: 2021-07-02T13:15:07.76+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.04%

Last modified Jun 17, 2026

CVE-2021-36125 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in the CentralAuth extension in MediaWiki through 1.36. The Special:GlobalRenameRequest page is vulnerable to infinite loops and denial of service attacks when a user's current username is beyond an arbitrary maximum configuration value (MaxNameChars).. EPSS estimates a 1.04% chance of exploitation in the next 30 days.

Description

An issue was discovered in the CentralAuth extension in MediaWiki through 1.36. The Special:GlobalRenameRequest page is vulnerable to infinite loops and denial of service attacks when a user's current username is beyond an arbitrary maximum configuration value (MaxNameChars).

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

1.04%

59.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-835

Affected Software

Vendor	Product	Versions
Mediawiki	Mediawiki	<= 1.36

References

https://gerrit.wikimedia.org/r/q/I97d8b3236b5abed8ba9a9c4d3ab5050c2e782c22Patch, Vendor Advisory
https://phabricator.wikimedia.org/T260865Exploit, Issue Tracking, Patch, Vendor Advisory
https://gerrit.wikimedia.org/r/q/I97d8b3236b5abed8ba9a9c4d3ab5050c2e782c22Patch, Vendor Advisory
https://phabricator.wikimedia.org/T260865Exploit, Issue Tracking, Patch, Vendor Advisory

Timeline

Published: Jul 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-36125?

How severe is CVE-2021-36125?

CVE-2021-36125 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.

How do I fix CVE-2021-36125?

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-2021-36125?

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

Scan your code now

Source: NVD / NIST