{"id":"CVE-2021-41800","aliases":["BIT-mediawiki-2021-41800","DEBIAN-CVE-2021-41800","DSA-4979-1","EUVD-2022-3541","GHSA-c8wv-qwwc-6j73","MGASA-2021-0477","UBUNTU-CVE-2021-41800"],"status":"published","title":"MediaWiki allows a denial of service","description":"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.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.01857,"percentile":0.79513,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-770"],"published":"2021-10-01T00:00:00Z","modified":"2026-10-23T18:02:30Z","fixes":[{"ecosystem":"Packagist","package":"mediawiki/core","fixed_in":["1.36.2"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"mediawiki","fixed_in":["1.36.2"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"mediawiki","fixed_in":["1:1.35.4-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"mediawiki","fixed_in":["1:1.35.4-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"mediawiki","fixed_in":["1:1.35.4-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"mediawiki/core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.36.2"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"mediawiki","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.36.2"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.35.4-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.35.4-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.35.4-1"}]}]},{"source":"osv","ecosystem":"Debian:10","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.31.16-1~deb10u1"}]}],"versions":["1:1.31.10-1~deb10u1","1:1.31.12-1~deb10u1","1:1.31.14-1~deb10u1","1:1.31.2-1","1:1.31.4-1","1:1.31.4-1~deb10u1","1:1.31.5-1","1:1.31.5-2","1:1.31.5-3","1:1.31.6-1","1:1.31.6-1~deb10u1","1:1.31.7-1","1:1.31.7-1~deb10u1","1:1.31.8-1"],"bundled":5},{"source":"osv","ecosystem":"Debian:11","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:1.35.4-1~deb11u1"}]}],"versions":["1:1.35.2-1","1:1.35.3-1"],"bundled":5},{"source":"osv","ecosystem":"Packagist","package":"mediawiki/core","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.36.2"}]}],"versions":["1.20.3","1.20.4","1.20.5","1.20.6","1.20.7","1.20.8","1.21.0","1.21.1","1.21.10","1.21.11","1.21.2","1.21.3","1.21.4","1.21.5","1.21.6","1.21.7","1.21.8","1.21.9","1.22.0rc0","1.24.0","1.24.0-rc.0","1.24.0-rc.1","1.24.0-rc.2","1.24.0-rc.3","1.24.1","1.24.2","1.24.3","1.24.4","1.24.5","1.24.6","1.25.0","1.25.0-rc.0","1.25.1","1.25.2","1.25.3","1.25.4","1.25.5","1.25.6","1.26.0","1.26.1","1.26.2","1.26.3","1.26.4","1.27.0","1.27.0-rc.0","1.27.0-rc.1","1.27.1","1.27.2","1.27.3","1.27.4","1.27.5","1.27.6","1.27.7","1.28.0","1.28.0-rc.0","1.28.0-rc.1","1.28.1","1.28.2","1.28.3","1.29.0","1.29.0-rc.0","1.29.0-rc.1","1.29.1","1.29.2","1.29.3","1.30.0","1.30.0-rc.0","1.30.1","1.30.2","1.31.0","1.31.0-rc.0","1.31.0-rc.1","1.31.0-rc.2","1.31.1","1.31.10","1.31.11","1.31.12","1.31.13","1.31.14","1.31.15","1.31.16","1.31.2","1.31.3","1.31.4","1.31.5","1.31.6","1.31.7","1.31.8","1.31.9","1.32.0","1.32.0-rc.0","1.32.0-rc.1","1.32.0-rc.2","1.32.1","1.32.2","1.32.3","1.32.4","1.32.5","1.32.6","1.33.0","1.33.0-rc.0","1.33.1","1.33.2","1.33.3","1.33.4","1.34.0","1.34.0-rc.0","1.34.0-rc.1","1.34.1","1.34.2","1.34.3","1.34.4","1.35.0","1.35.0-rc.0","1.35.0-rc.1","1.35.0-rc.2","1.35.0-rc.3","1.35.1","1.35.10","1.35.11","1.35.12","1.35.13","1.35.14","1.35.2","1.35.3","1.35.4","1.35.5","1.35.6","1.35.7","1.35.8","1.35.9","1.36.0","1.36.0-rc.0","1.36.1"]},{"source":"osv","ecosystem":"Mageia:8","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.35.4-1.mga8"}]}],"bundled":4},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.27.3-1","1:1.27.4-1","1:1.27.4-2","1:1.27.4-3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.31.2-1ubuntu1","1:1.31.5-1","1:1.31.5-1ubuntu1","1:1.31.5-2","1:1.31.5-3","1:1.31.5-3ubuntu1","1:1.31.6-1","1:1.31.7-1","1:1.31.7-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.35.3-1","1:1.35.4-1","1:1.35.5-1","1:1.35.5-1ubuntu1","1:1.35.5-1ubuntu2","1:1.35.5-1ubuntu3","1:1.35.6-1","1:1.35.6-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"mediawiki","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.39.4-2","1:1.39.5-1","1:1.39.6-1","1:1.39.7-1","1:1.39.7-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:25.10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Required","web","report"]},{"url":"https://lists.wikimedia.org/hyperkitty/list/wikitech-l%40lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/","tags":["x_transferred","web"]},{"url":"https://github.com/wikimedia/mediawiki/commit/781caf83dba90c18349f930bbaaa0e89f003f874","tags":["x_transferred","Patch","Third Party Advisory","web","fix"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/","tags":["vendor-advisory","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN/","tags":["vendor-advisory","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA/","tags":["vendor-advisory","x_transferred","web"]},{"url":"https://security.gentoo.org/glsa/202305-24","tags":["vendor-advisory","x_transferred","web","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-41800","tags":["web","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/"},{"url":"https://lists.wikimedia.org/hyperkitty/list/wikitech-l@lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/","tags":["report"]},{"url":"https://github.com/advisories/GHSA-c8wv-qwwc-6j73"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-41800","tags":["advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX","tags":["web"]},{"url":"https://lists.wikimedia.org/hyperkitty/list/wikitech-l@lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5","tags":["web"]},{"url":"https://advisories.mageia.org/MGASA-2021-0477.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=29531","tags":["report"]},{"url":"https://www.debian.org/security/2021/dsa-4979","tags":["web"]},{"url":"https://lists.wikimedia.org/hyperkitty/list/mediawiki-announce@lists.wikimedia.org/thread/2IFS5CM2YV4VMSODPX3J2LFHKSEWVFV5/","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/thread/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2021-41800","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-41800","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-41800","description":"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.","status":"published","published":"2021-10-11T00:00:00Z","modified":"2024-08-04T03:22:24.334Z","updated_at":"2026-11-02T14:32:59.105382Z"}],"euvd":[{"id":"EUVD-2022-3541","description":"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.","status":"published","published":"2021-10-11T00:00:00Z","modified":"2024-08-04T03:22:24Z","updated_at":"2026-11-03T03:24:17.230256Z"}],"ghsa":[{"id":"GHSA-c8wv-qwwc-6j73","title":"MediaWiki allows a denial of service","description":"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.","status":"published","published":"2022-05-24T19:17:14Z","modified":"2024-02-01T21:50:09Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:37:34.405364Z"}],"nvd":[{"id":"CVE-2021-41800","description":"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.","status":"published","published":"2021-10-11T08:15:06.813Z","modified":"2026-06-17T04:08:56.2Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:06:59.689345Z"}],"osv":[{"id":"CVE-2021-41800","description":"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.","status":"published","published":"2021-10-11T08:15:06.813Z","modified":"2026-10-20T10:54:02.473924834Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:44:21.557945Z"},{"id":"DEBIAN-CVE-2021-41800","description":"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.","status":"published","published":"2021-10-11T08:15:06.813Z","modified":"2026-10-23T18:02:30.277951474Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:45:35.799676Z"},{"id":"GHSA-c8wv-qwwc-6j73","title":"MediaWiki allows a denial of service","description":"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.","status":"published","published":"2022-05-24T19:17:14Z","modified":"2024-02-20T05:23:07.235813Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:46:44.927642Z"},{"id":"UBUNTU-CVE-2021-41800","description":"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.","status":"published","published":"2021-10-11T08:15:00Z","modified":"2026-10-17T12:56:15.616060966Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:54:29.220315Z"},{"id":"BIT-mediawiki-2021-41800","description":"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.","status":"published","published":"2024-03-06T11:10:57.681Z","modified":"2025-04-03T14:40:37.652Z","updated_at":"2026-11-02T15:28:33.072289Z"},{"id":"DSA-4979-1","title":"mediawiki - security update","status":"published","published":"2021-10-01T00:00:00Z","modified":"2026-03-09T02:10:09.371177Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"MGASA-2021-0477","title":"Updated mediawiki packages fix security vulnerability","description":"XSS vulnerability in Special:Search. (CVE-2021-41798)\nApiQueryBacklinks can cause a full table scan. (CVE-2021-41799)\nFix PoolCounter protection of Special:Contributions. (CVE-2021-41800)\nReplaceText continues performing actions if the user no longer has the\ncorrect permission (such as by being blocked). (CVE-2021-41801)\n","status":"published","published":"2021-10-13T19:39:52Z","modified":"2026-04-16T04:40:38.346680857Z","updated_at":"2026-11-02T15:49:41.849028Z"}]}}