CVE-2021-41799

HIGH7.5EPSS 1.2%

Published: 10/11/2021Modified: 4/28/2026

Description

MediaWiki before 1.36.2 allows a denial of service (resource consumption because of lengthy query processing time). ApiQueryBacklinks (action=query&list=backlinks) can cause a full table scan.

Affected packages (2)

Bitnami/mediawikifrom 0, < 1.36.2
Debian/mediawikifrom 0, < 1:1.35.4-1~deb11u1

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References (8)

ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-41799
WEBhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN/
WEBhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA/
WEBhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/
WEBhttps://lists.wikimedia.org/hyperkitty/list/wikitech-l%40lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/
WEBhttps://nvd.nist.gov/vuln/detail/CVE-2021-41799
WEBhttps://phabricator.wikimedia.org/T290394
WEBhttps://security.gentoo.org/glsa/202305-24