CVE-2000-1022: The mailguard feature in Cisco Secure PIX Firewall 5.2(2) and earlier does not properly restrict access to...

Security readout for executives and security teams

This is an old Cisco Secure PIX Firewall Mailguard issue. Mailguard was meant to limit SMTP commands, but affected versions could be bypassed by placing restricted SMTP commands after DATA. Business risk depends on whether any legacy PIX firewalls still process mail traffic. Exposure is most likely in legacy environments still running Cisco Secure PIX Firewall with Mailguard/SMTP filtering enabled. Modern exposure should be rare, but unmanaged or forgotten perimeter devices could remain at risk. Treat as a legacy exposure check, not an emergency based on current evidence. Prioritize if PIX devices still protect mail flows, because unsupported perimeter security controls create operational risk beyond this CVE. Mitigation focus: Inventory any Cisco Secure PIX Firewall devices and firmware versions.; Check Cisco's advisory for confirmed fixed versions or supported workarounds.; Disable reliance on Mailguard as the only SMTP control where possible..

Prepared

Jul 11, 2026, 23:45 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.