Which products and versions are affected by CVE-2009-0077?

Affected: Forefront Threat Management Gateway (Microsoft); Internet Security And Acceleration Server (Microsoft) versions 2004-sp3, 2006-sp1, 2006-supportability. The full list is in the CVE brief.

Is CVE-2009-0077 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2009-0077 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2009-0077?

No public exploit code is known.

Is there a fix for CVE-2009-0077?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2009-0077 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2009-0077

Medium

Published Apr 15, 2009 · Updated Apr 22, 2026

Key Facts

Patch immediately

CVE-2009-0077 is a medium-severity vulnerability (CVSS 5.0 v2) affecting Forefront Threat Management Gateway (Microsoft), Internet Security And Acceleration Server (Microsoft).
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 78% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

5.0

AV:N/AC:L/Au:N/C:N/I:N/A:P

EPSS (30-day exploit likelihood)

78%

Higher than 99.5% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

None known

Get the full CVE-2009-0077 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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."

Affected Products

5 affected entries in total

Product	Affected versions	Fixed in
Forefront Threat Management GatewayMicrosoft	See advisory	n/a
Internet Security And Acceleration ServerMicrosoft	2004-sp3, 2006-sp1, 2006-supportability	n/a

Timeline

Publicly disclosed
Apr 15, 2009
Last updated
Apr 22, 2026

References

2 more references in the full CVE brief

FAQ

Common Questions.

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 de…
Affected: Forefront Threat Management Gateway (Microsoft); Internet Security And Acceleration Server (Microsoft) versions 2004-sp3, 2006-sp1, 2006-supportability. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2009-0077 Running On Your Attack Surface?

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