CVE-2003-0540: Conectiva Linux

Medium severity, CVSS 5.0. EPSS: 21.3% chance of exploitation in the next 30 days.

The address parser code in Postfix 1.1.12 and earlier allows remote attackers to cause a denial of service (lock) via (1) a malformed envelope address to a local host that would generate a bounce and contains the ".!" string in the MAIL FROM or Errors-To headers, which causes nqmgr to lock up, or (2) via a valid MAIL FROM with a RCPT TO containing a ".!" string, which causes an instance of the SMTP listener to lock up.

Affected products

• Conectiva Linux: version 7.0 only; version 8.0 only
• Wietse Venema Postfix: version 1.0.21 only; version 1.1.11 only; version 1.1.12 only; version 1999-09-06 only; version 1999-12-31 only; version 2000-02-28 only; …

Published 2003-08-27. Last modified 2026-06-16.