CVE-2001-0692: SMTP proxy in WatchGuard Firebox (2500 and 4500) 4.5 and 4.6 allows a remote attacker to bypass firewall fi...

Security readout for executives and security teams

This old CVE describes a way for email attachments to pass through WatchGuard Firebox SMTP proxy filtering when the message uses a malformed MIME boundary. The business risk is missed email-content enforcement, not direct system takeover. Evidence is limited to legacy Firebox 2500 and 4500 firmware versions 4.5 and 4.6. Exposure appears limited to organizations still operating legacy WatchGuard Firebox 2500 or 4500 devices on versions 4.5 or 4.6 with SMTP proxy filtering enabled in an email path. Treat this as a legacy exposure check. It is not supported by current exploitation evidence in the supplied sources, but any affected device in production email traffic should be remediated because filtering bypass undermines mail security controls. Mitigation focus: Inventory WatchGuard Firebox 2500 and 4500 devices and firmware versions.; Confirm whether SMTP proxy filtering is enabled on any mail path.; Check WatchGuard guidance or archived advisories for fixed firmware or supported migration paths..

Prepared

Jul 1, 2026, 07:46 UTC (UTC+00:00)

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