6.5

CVE-2021-31553: mediawiki Unquoted Search Path or Element

CVSS: 6.5v3.1MediumModified
Published 22-04-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-31553 is a medium (CVSS 6.5) Unquoted Search Path or Element vulnerability in mediawiki. EPSS estimates a 1.40% chance of exploitation in the next 30 days, higher than 72.2% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
1.40%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 22-04-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

1.40%

Chance of exploitation in the next 30 days

Percentile

72%

Versus all other CVEs

30-day change

0.00 pp

From 1.40% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.40%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Mediawiki1 product

1 vendor · 1 product

References

7 links