Vulnerability in MediaWiki
CVE-2021-31553
An issue was discovered in the CheckUser extension for MediaWiki through 1.35.2. MediaWiki usernames with trailing whitespace could be stored in the cu_log database table such that denial of service occurred for certain CheckUser extension pages and functionality. For example, the attacker could turn off Special:CheckUserLog and thus interfere with usage tracking.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.014 (71.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
Weakness classification (CWE)
References
- phabricator.wikimedia.org/T275669 (Third Party Advisory)
- gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667023 (Third Party Advisory, Issue Tracking)
- gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667024 (Third Party Advisory, Issue Tracking)
- gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667025 (Third Party Advisory, Issue Tracking)
- gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/667027 (Third Party Advisory, Issue Tracking)
- gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666963 (Third Party Advisory, Issue Tracking)
- gerrit.wikimedia.org/r/c/mediawiki/extensions/CheckUser/+/666964 (Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2021-31553?
- CVE-2021-31553 is a medium-severity vulnerability in MediaWiki, classified under Unquoted Search Path or Element. CVSS score: 6.5/10. Published 2021-04-22.
- How severe is CVE-2021-31553?
- Medium severity. CVSS v3 base score is 6.5 out of 10.