CVE-2003-0819: Buffer overflow in the H.323 filter of Microsoft Internet Security and Acceleration Server 2000 allows remo...

Security readout for executives and security teams

This is an old remote code execution issue in Microsoft Internet Security and Acceleration Server 2000. Malformed H.323/H.225 traffic could overflow the H.323 filter and execute code in the Microsoft Firewall Service. Treat it as urgent only if this legacy product or compatible firewall service remains deployed. Exposure is likely limited to legacy environments running Microsoft ISA Server 2000 with the H.323 filter processing H.323/H.225 traffic. Modern environments without ISA Server 2000 are unlikely to be affected based on the provided sources. High priority for organizations with legacy Microsoft ISA Server 2000 at network boundaries. If the product is absent, this CVE should be documented as not applicable rather than treated as an active crisis. Mitigation focus: Inventory for Microsoft ISA Server 2000 and the Microsoft Firewall Service.; Review and apply Microsoft MS04-001 guidance where this product exists.; If patch status is unknown, reduce exposure to H.323/H.225 traffic..

Prepared

Jun 30, 2026, 07:43 UTC (UTC+00:00)

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