CVE-2021-36125 Denial of service in n/a
Attackers can cause denial of service via infinite loops in MediaWiki's CentralAuth extension when usernames exceed configured maximum length limits.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-36125?
CVE-2021-36125 is a high-severity denial of service vulnerability in Mediawiki Mediawiki, published on 2 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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).
Weakness: CWE-835
Which versions are affected by CVE-2021-36125?
1 open source package ship an affected version, including mediawiki. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mediawiki Bitnami | All versions | 1.36.1 |
Products include Mediawiki Mediawiki.
How do I fix CVE-2021-36125?
Upgrade mediawiki to 1.36.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-36125 being exploited?
There is no known exploitation of CVE-2021-36125 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as BIT-mediawiki-2021-36125, GHSA-52vr-v6fr-rfg8.