CVE-2009-2939: Postfix

Medium severity, CVSS 6.9. EPSS: 0.5% chance of exploitation in the next 30 days.

The postfix.postinst script in the Debian GNU/Linux and Ubuntu postfix 2.5.5 package grants the postfix user write access to /var/spool/postfix/pid, which might allow local users to conduct symlink attacks that overwrite arbitrary files.

Affected products

• Postfix Postfix: version 2.5.5 only

Published 2009-09-21. Last modified 2026-06-16.