Join or Sign In

Sign in to add and modify your software

Sign in with Facebook Sign in with email

By joining, you agree to our Terms of Use and acknowledge the data practices in our Privacy Agreement.

ISA Server 2000 - Vulnerability in H.323 Filter Can Cause Remote Code Execution (816458)

By Microsoft Free

Developer's Description

A critical security vulnerability exists in the H.323 filter for Microsoft ISA Server 2000 that could allow an attacker to overflow a buffer on the Microsoft Firewall Service in Microsoft ISA Server 2000. The vulnerability results because the H.323 filter for the Microsoft Firewall Service does not perform proper boundary checks on specially formatted H.323 packets.

An attacker who successfully exploited this vulnerably could attempt to run code of their choosing in the security context of the Microsoft Firewall Service, giving the attacker complete control over the system. ISA Servers running in cache mode are not vulnerable because the Microsoft Firewall Service is disabled by default. However, since the H.323 filter is enabled by default on systems installed in Integrated or Firewall mode, installing this security update is highly recommended. This version is the first release on CNET

Full Specifications

What's new in version 3

This version is the first release on CNET


Release December 5, 2008
Date Added September 14, 2007
Version 3

Operating Systems

Operating Systems Windows, Windows 2000
Additional Requirements Windows 2000/2003 Server


Total Downloads 270
Downloads Last Week 0
Report Software

Related Software

AVG Antivirus Business Edition

Free to try
AVG Antivirus Business Edition

Pulse Secure for Windows 10

Pulse Secure for Windows 10

TouchVPN for Windows 10

TouchVPN for Windows 10



Best VPN Services for 2021

Best for privacy

3 months free with 1-year plan

Best for customer support

$39.99 for the first 12 months

Best for zero logs

$4.87.99/months for a 1-year plan

Best money-back guarantee

$2.99/months for a 3-year plan