CVE-2021-30158: debian debian_linux Improper Authentication
Vulnerability summary
CVE-2021-30158 is a medium (CVSS 5.3) Improper Authentication vulnerability in debian debian_linux. EPSS estimates a 1.73% chance of exploitation in the next 30 days, higher than 77.6% of scored vulnerabilities. 1 public exploit is recorded.
Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 3Timeline
- 06-04-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in MediaWiki before 1.31.12 and 1.32.x through 1.35.x before 1.35.2. Blocked users are unable to use Special:ResetTokens. This has security relevance because a blocked user might have accidentally shared a token, or might know that a token has been compromised, and yet is not able to block any potential future use of the token by an unauthorized party.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS trend
Probability
1.73%
Chance of exploitation in the next 30 days
Percentile
78%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.73% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (phabricator.wikimedia.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian2 products
- mediawiki< 1:1.35.2-1
- debian_linuxEOL9.0 | 10.0
Fedoraproject1 product
- fedoraEOL33 | 34
Mediawiki1 product
- mediawiki< 1.31.12 | ≥ 1.32.0, < 1.35.2
Ubuntu1 product
- mediawikiAll versions (No fix recorded)
4 vendors · 5 products
References
11 links
- lists.debian.org/debian-lts-announce/2021/05/msg00003.htmlMailing ListX Refsource MLISTThird Party Advisory
- lists.debian.org/debian-lts-announce/2021/05/msg00006.htmlMailing ListX Refsource MLISTThird Party Advisory