CVE-2000-1022: Cisco Pix Firewall Software

High severity, CVSS 7.5. EPSS: 7.1% chance of exploitation in the next 30 days.

The mailguard feature in Cisco Secure PIX Firewall 5.2(2) and earlier does not properly restrict access to SMTP commands, which allows remote attackers to execute restricted commands by sending a DATA command before sending the restricted commands.

Affected products

• Cisco Pix Firewall Software: version 4.2(1) only; version 4.2(2) only; version 4.2(5) only; version 4.3 only; version 4.4(4) only; version 5.0 only; …

Published 2000-12-11. Last modified 2026-06-16.