CVE-2025-43921: gnu mailman Incorrect Authorization
CVSS: 5.3v3.1MediumModified
AliasesUBUNTU-CVE-2025-43921
Published 20-04-2025Last modified 28-04-2025
Vulnerability summary
CVE-2025-43921 is a medium (CVSS 5.3) Incorrect Authorization vulnerability in gnu mailman. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 37.7% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)EPSS score
0.45%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 20-04-2025PublishedVulnerability first disclosed.
- 28-04-2025Last modifiedVulnerability information updated.
Description
GNU Mailman 2.1.39, as bundled in cPanel (and WHM), allows unauthenticated attackers to create lists via the /mailman/create endpoint. NOTE: multiple third parties report that they are unable to reproduce this, regardless of whether cPanel or WHM is used.
CVSS metrics
3 scores · 3 sources · 1 versionMedium 5.3Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS trend
Probability
0.45%
Chance of exploitation in the next 30 days
Percentile
38%
Versus all other CVEs
30-day change
0.00 pp
From 0.45% on 18-09-2026
18-09-202618-10-2026
EPSS score0.45%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundCve 2025 43921
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Gnu1 product
- mailman2.1.39 | ≥ 2.1.1, ≤ 2.1.39
Ubuntu1 product
- mailmanAll versions (No fix recorded)
2 vendors · 2 products