8.1

CVE-2025-43920: gnu mailman OS Command Injection

CVSS: 8.1v3.1HighModified
AliasesUBUNTU-CVE-2025-43920
Published 20-04-2025Last modified 28-04-2025
Open JSON

Vulnerability summary

CVE-2025-43920 is a high (CVSS 8.1) OS Command Injection vulnerability in gnu mailman. EPSS estimates a 0.59% chance of exploitation in the next 30 days, higher than 46.9% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
43/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (NVD)
EPSS score
0.59%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 20-04-2025
    PublishedVulnerability first disclosed.
  2. 28-04-2025
    Last modifiedVulnerability information updated.

Description

GNU Mailman 2.1.39, as bundled in cPanel (and WHM), in certain external archiver configurations, allows unauthenticated attackers to execute arbitrary OS commands via shell metacharacters in an email Subject line. 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 version

EPSS trend

Probability

0.59%

Chance of exploitation in the next 30 days

Percentile

47%

Versus all other CVEs

30-day change

0.00 pp

From 0.59% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.59%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Cve 2025 43920

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Gnu1 product
  • mailman2.1.39 | ≥ 2.1.1, ≤ 2.1.39
Ubuntu1 product
  • mailmanAll versions (No fix recorded)

2 vendors · 2 products

References

6 links