CVE-2007-4440: Pmail Mercury Mail Transport System

High severity, CVSS 7.5. EPSS: 64.5% chance of exploitation in the next 30 days.

Stack-based buffer overflow in the MercuryS SMTP server in Mercury Mail Transport System, possibly 4.51 and earlier, allows remote attackers to execute arbitrary code via a long AUTH CRAM-MD5 string. NOTE: this might overlap CVE-2006-5961.

Affected products

• Pmail Mercury Mail Transport System: up to and including 4.51

Published 2007-08-21. Last modified 2026-06-16.