CVE-2021-41800 json
MediaWiki allows a denial of service
published 5y ago modified 4mo ago also BIT-mediawiki-2021-41800 , EUVD-2022-3541 , GHSA-c8wv-qwwc-6j73
- cvss
- 5.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.9%
- EPSS 1.9% chance of exploitation in 30 days, percentile 79%
- public exploits
- 0
- none known
Summary
MediaWiki before 1.36.2 allows a denial of service (resource consumption because of lengthy query processing time). Visiting Special:Contributions can sometimes result in a long running SQL query because PoolCounter protection is mishandled.
Patch / fix
- packagist mediawiki/core 1.36.2
- bitnami mediawiki 1.36.2
- mediawiki mediawiki 1.36.2
- mediawiki Debian 14, Debian 13, Debian 12 1:1.35.4-1
debian advisories DEBIAN-CVE-2021-41800
- mediawiki Arch Linux 1.36.2-1
arch linux advisories AVG-2434
Is CVE-2021-41800 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2021-41800 updated cvss 5.3
mediawiki: mishandled PoolCounter's protection may result DoS when visiting Special:Contributions.
-
Red Hat OpenShift Container Platform 3.11 mediawikiaffected: no fix planned “Out of support scope”
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
1.86% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
| OSV | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | mediawiki/core | <1.36.2 |
1.36.2 |
| bitnami | mediawiki | <1.36.2 |
1.36.2 |
Classification
- Weakness
-
- CWE-770 Allocation of Resources Without Limits or Throttling
References
-
github.com
/wikimedia/mediawiki/commit/781caf83dba90c18349f930bbaaa0e89f003f874
web, patch, third-party-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/
vendor-advisory, web
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN/
vendor-advisory, web
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA/
vendor-advisory, web
-
security.gentoo.org
/glsa/202305-24
vendor-advisory, web
-
phabricator.wikimedia.org
/T284419
web, permissions-required
-
lists.wikimedia.org
/hyperkitty/list/wikitech-l%40lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/
web
-
nvd.nist.gov
/vuln/detail/CVE-2021-41800
advisory, web
-
lists.fedoraproject.org
/archives/list/package-announce@lists.fedoraproject.org/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN
web
-
lists.fedoraproject.org
/archives/list/package-announce@lists.fedoraproject.org/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA
web
-
lists.fedoraproject.org
/archives/list/package-announce@lists.fedoraproject.org/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX
web
-
lists.wikimedia.org
/hyperkitty/list/wikitech-l@lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5
web
Sources
- CVE List CVE-2021-41800
- GitHub Advisory GHSA-c8wv-qwwc-6j73
- NVD CVE-2021-41800
- OSV BIT-mediawiki-2021-41800
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.