CVE-2025-43920 describes a critical OS command injection vulnerability in GNU Mailman 2.1.39, specifically when bundled with cPanel/WHM and configured with external archivists. Unauthenticated attackers can execute arbitrary OS commands by injecting shell metacharacters into email subject lines. With a CVSS score of 8.1 (High), this vulnerability presents a significant risk due to its network-based attack vector, low attack complexity, and potential for complete compromise of confidentiality, integrity, and availability. Despite its severity, multiple third parties report difficulty reproducing the exploit, and there is currently no evidence of active exploitation, public exploit code, or significant community discussion.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2.1.1, <= 2.1.39CPE matchmatch criteria | cpe:2.3:a:gnu:mailman:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.