CVE-2007-4991: Microsoft Isa Server

Medium severity, CVSS 5.0. EPSS: 16.1% chance of exploitation in the next 30 days.

The SOCKS4 Proxy in Microsoft Internet Security and Acceleration (ISA) Server 2004 SP1 and SP2 allows remote attackers to obtain potentially sensitive information (the destination IP address of another user's session) via an empty packet.

Affected products

• Microsoft Isa Server: version 2004 only

Published 2007-09-21. Last modified 2026-06-16.