Is CVE-2009-0077 actively exploited?

CVE-2009-0077 has no public evidence of in-the-wild exploitation as of 2026-04-23.

What is the CVSS score for CVE-2009-0077?

CVE-2009-0077 has a CVSS score of 5 (UNKNOWN severity). Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P.

How do I patch CVE-2009-0077?

Patch guidance is available from microsoft security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2009-0077.

CVE-2009-0077 - remediation guidance & executive summary

Q: Which products are affected by CVE-2009-0077?

5 products: microsoft forefront threat management gateway, microsoft internet security and acceleration server, microsoft internet security and acceleration server, microsoft internet security and acceleration server, microsoft internet security and acceleration server.

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."

CVSS Metrics

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector: network
Access Cmplx: low
Auth: none
Confidentiality: none
Integrity: none
Availability: partial
Weaknesses: NVD-CWE-Other

Metadata

Primary Vendor: MICROSOFT
Published: 4/15/2009
Last Modified: 4/23/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

microsoft : forefront_threat_management_gatewaymicrosoft : internet_security_and_acceleration_servermicrosoft : internet_security_and_acceleration_servermicrosoft : internet_security_and_acceleration_servermicrosoft : internet_security_and_acceleration_server

Remediation Guidance

Executive Summary

View on NIST NVD