CVE-2009-0077: Microsoft Forefront Threat Management Gateway

Medium severity, CVSS 5.0. EPSS: 78.5% chance of exploitation in the next 30 days.

The firewall engine in Microsoft Forefront Threat Management Gateway, Medium Business Edition (TMG MBE); and Internet Security and Acceleration (ISA) Server 2004 SP3, 2006, 2006 Supportability Update, and 2006 SP1; does not properly manage the session state of web listeners, which allows remote attackers to cause a denial of service (many stale sessions) via crafted packets, aka "Web Proxy TCP State Limited Denial of Service Vulnerability."

Affected products

• Microsoft Forefront Threat Management Gateway: affected versions not specified
• Microsoft Internet Security And Acceleration Server: version 2004 only; version 2006 only

Published 2009-04-15. Last modified 2026-06-16.