Vulnerability Details : 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 2021-04-22 03:15:08
Updated 2021-04-22 20:14:45
Source MITRE
View at NVD,   CVE.org
Vulnerability category: Denial of service

Exploit prediction scoring system (EPSS) score for CVE-2021-31553

EPSS FAQ
0.29%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 66 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-31553

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
6.4
 MEDIUM AV:N/AC:L/Au:N/C:N/I:P/A:P
10.0
4.9
 NIST
6.5
 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
3.9
2.5
 NIST

CWE ids for CVE-2021-31553

  • The product uses a search path that contains an unquoted element, in which the element contains whitespace or other separators. This can cause the product to access resources in a parent path.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-31553

Products affected by CVE-2021-31553

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