CVE-2007-4565: Fetchmail

Medium severity, CVSS 5.0. EPSS: 2% chance of exploitation in the next 30 days.

sink.c in fetchmail before 6.3.9 allows context-dependent attackers to cause a denial of service (NULL dereference and application crash) by refusing certain warning messages that are sent over SMTP.

Affected products

• Fetchmail Fetchmail: up to and including 6.3.9; version 4.5.1 only; version 4.5.2 only; version 4.5.3 only; version 4.5.4 only; version 4.5.5 only; …

Published 2007-08-28. Last modified 2026-06-16.