---
title: "CVE-2009-0077: The firewall engine in Microsoft Forefront… | CubePath"
description: "The firewall engine in Microsoft Forefront Threat Management Gateway, Medium Business Edition (TMG MBE); and Internet Security and Acceleration (ISA)…"
language: en
source: https://cubepath.com/security/cve/CVE-2009-0077
---

# CVE-2009-0077: The firewall engine in Microsoft Forefront… | CubePath

## Description

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."

Official description from the CVE record, published by microsoft. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2009-0077)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.78496 (78.5% probability)

Percentile

99.6%

Scores of

Nov 10, 2026

Model

v2026.06.15

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [1022045](http://www.securitytracker.com/id?1022045)  (securitytracker.com) vdb-entry
- [MS09-016](https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-016)  (docs.microsoft.com) vendor-advisory
- [53636](http://osvdb.org/53636)  (osvdb.org) vdb-entry
- [TA09-104A](http://www.us-cert.gov/cas/techalerts/TA09-104A.html)  (us-cert.gov) third-party-advisory
- [ADV-2009-1030](http://www.vupen.com/english/advisories/2009/1030)  (vupen.com) vdb-entry
- [34687](http://secunia.com/advisories/34687)  (secunia.com) third-party-advisory
- [oval:org.mitre.oval:def:6068](https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6068)  (oval.cisecurity.org) vdb-entry signature

## Timeline

1. ID reserved Jan 8, 2009
2. Record published Apr 15, 2009
3. Record last updated Aug 7, 2024

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:00 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)