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CVE-2021-41800

MediaWiki allows a denial of service

5.3 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
Low

Exploit likelihood

1.86%Up 0.8 points since Oct 11, 2021
90%50%10%1%

What each source reports

NVD Score used 5.3

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.

Record
CVE-2021-41800
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-770
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2021-41800
Updated
2026-11-02
EUVDEUVD-2022-3541 No score

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.

Record
EUVD-2022-3541
Updated
2026-11-03
GitHub AdvisoriesGHSA-c8wv-qwwc-6j73 5.3

MediaWiki allows a denial of service

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.

Record
GHSA-c8wv-qwwc-6j73
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-770
Updated
2026-11-02
OSV 5.3

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.

Record
CVE-2021-41800
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVDEBIAN-CVE-2021-41800 5.3

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.

Record
DEBIAN-CVE-2021-41800
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
Show 4 moreShow less
OSVGHSA-c8wv-qwwc-6j73 5.3

MediaWiki allows a denial of service

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.

Record
GHSA-c8wv-qwwc-6j73
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-770
Updated
2026-11-02
OSVUBUNTU-CVE-2021-41800 5.3

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.

Record
UBUNTU-CVE-2021-41800
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVBIT-mediawiki-2021-41800 No score

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.

Record
BIT-mediawiki-2021-41800
Updated
2026-11-02
OSVMGASA-2021-0477 No score

Updated mediawiki packages fix security vulnerability

XSS vulnerability in Special:Search. (CVE-2021-41798) ApiQueryBacklinks can cause a full table scan. (CVE-2021-41799) Fix PoolCounter protection of Special:Contributions. (CVE-2021-41800) ReplaceText continues performing actions if the user no longer has the correct permission (such as by being blocked). (CVE-2021-41801)

Record
MGASA-2021-0477
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mediawiki/core
Packagist
 before 1.36.2
1.36.2
mediawiki
Bitnami
 before 1.36.2
1.36.2
mediawiki
Debian:12
 before 1:1.35.4-1
1:1.35.4-1
mediawiki
Debian:13
 before 1:1.35.4-1
1:1.35.4-1
mediawiki
Debian:14
 before 1:1.35.4-1
1:1.35.4-1
mediawiki
Debian:10
From an advisory covering 5 CVEs
 before 1:1.31.16-1~deb10u1, plus listed versions
1:1.31.10-1~deb10u11:1.31.12-1~deb10u11:1.31.14-1~deb10u11:1.31.2-11:1.31.4-1
Show 9 moreShow less
1:1.31.4-1~deb10u11:1.31.5-11:1.31.5-21:1.31.5-31:1.31.6-11:1.31.6-1~deb10u11:1.31.7-11:1.31.7-1~deb10u11:1.31.8-1
1:1.31.16-1~deb10u1
mediawiki
Debian:11
From an advisory covering 5 CVEs
 before 1:1.35.4-1~deb11u1, plus listed versions
1:1.35.2-11:1.35.3-1
1:1.35.4-1~deb11u1
mediawiki/core
Packagist
 before 1.36.2, plus listed versions
1.20.31.20.41.20.51.20.61.20.7
Show 45 moreShow less
1.20.81.21.01.21.11.21.101.21.111.21.21.21.31.21.41.21.51.21.61.21.71.21.81.21.91.22.0rc01.24.01.24.0-rc.01.24.0-rc.11.24.0-rc.21.24.0-rc.31.24.11.24.21.24.31.24.41.24.51.24.61.25.01.25.0-rc.01.25.11.25.21.25.31.25.41.25.51.25.61.26.01.26.11.26.21.26.31.26.41.27.01.27.0-rc.01.27.0-rc.11.27.11.27.21.27.31.27.4
1.36.2
mediawiki
Mageia:8
From an advisory covering 4 CVEs
 before 1.35.4-1.mga8
1.35.4-1.mga8
mediawiki
Ubuntu:18.04:LTS
 All versions, plus listed versions
1:1.27.3-11:1.27.4-11:1.27.4-21:1.27.4-3
 None known
Show 6 moreShow less
Affected packages
PackageAffectedFixed
mediawiki
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
1:1.31.2-1ubuntu11:1.31.5-11:1.31.5-1ubuntu11:1.31.5-21:1.31.5-3
Show 4 moreShow less
1:1.31.5-3ubuntu11:1.31.6-11:1.31.7-11:1.31.7-1ubuntu0.1~esm1
 None known
mediawiki
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
1:1.35.3-11:1.35.4-11:1.35.5-11:1.35.5-1ubuntu11:1.35.5-1ubuntu21:1.35.5-1ubuntu31:1.35.6-11:1.35.6-1ubuntu0.1~esm1
 None known
mediawiki
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
1:1.39.4-21:1.39.5-11:1.39.6-11:1.39.7-11:1.39.7-1ubuntu0.1~esm1
 None known
mediawiki
Ubuntu:25.10
 All versions, plus listed versions
1:1.43.1+dfsg-11:1.43.1+dfsg-21:1.43.3+dfsg-1
 None known
mediawiki
Ubuntu:26.10
 All versions, plus listed versions
1:1.43.8+dfsg-21:1.43.9+dfsg-11:1.43.9+dfsg-1ubuntu1
 None known
mediawiki
Ubuntu:26.04:LTS
 All versions, plus listed versions
1:1.43.3+dfsg-11:1.43.5+dfsg-11:1.43.6+dfsg-21:1.43.8+dfsg-11:1.43.8+dfsg-2
 None known

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-41800 is a medium vulnerability (CVSS 5.3) in Mediawiki, published October 1, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.86%, the 79th percentile. Fixed in mediawiki/core 1.36.2.

References

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This page doesn't list everything

Left out here: 84 versions. The JSON record has them.

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