4.3

CVE-2021-30159: debian debian_linux

Modified
AliasesUBUNTU-CVE-2021-30159DEBIAN-CVE-2021-30159
Published 09-04-2021Last modified 03-08-2024

Vulnerability summary

CVE-2021-30159 is a medium (CVSS 4.3) vulnerability in debian debian_linux. EPSS estimates a 1.52% chance of exploitation in the next 30 days, higher than 74.6% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 4.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.3/10
010
Medium · v3.1 (NVD)
EPSS score
1.52%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 3
DLA-2648-1DSA-4889-1MGASA-2021-0218

Timeline

  1. 09-04-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last 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. Users can bypass intended restrictions on deleting pages in certain "fast double move" situations. MovePage::isValidMoveTarget() uses FOR UPDATE, but it's only called if Title::getArticleID() returns non-zero with no special flags. Next, MovePage::moveToInternal() will delete the page if getArticleID(READ_LATEST) is non-zero. Therefore, if the page is missing in the replica DB, isValidMove() will return true, and then moveToInternal() will unconditionally delete the page if it can be found in the master.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.52%

Chance of exploitation in the next 30 days

Percentile

75%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.52% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (phabricator.wikimedia.org)

    Maturity: unknown

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian2 products
Fedoraproject1 product
Mediawiki1 product
Ubuntu1 product
  • mediawikiAll versions (No fix recorded)

4 vendors · 5 products

References

12 links
Show all 12 references