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CVE-2009-0077

60
FAUCET Score

CVE-2009-0077 describes a denial-of-service vulnerability in the firewall engine of Microsoft Forefront Threat Management Gateway (TMG MBE) and various versions of Internet Security and Acceleration (ISA) Server. The flaw stems from improper management of web listener session states, allowing remote attackers to create numerous stale sessions with crafted packets. With a CVSS score of 5.0 (AV:N/AC:L/Au:N/C:N/I:N/A:P), this vulnerability is easily exploitable over the network with low attack complexity, leading to a partial denial of service. While there is no evidence of active exploitation, public exploit code, or KEV listing, the vulnerability has garnered significant community discussion, indicating awareness and potential interest.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:forefront_threat_management_gateway:-:-:medium_business:*:*:*:*:*
2004CPE matchmatch criteria
cpe:2.3:a:microsoft:internet_security_and_acceleration_server:2004:sp3:enterprise:*:*:*:*:*
2004CPE matchmatch criteria
cpe:2.3:a:microsoft:internet_security_and_acceleration_server:2004:sp3:standard:*:*:*:*:*
2006CPE matchmatch criteria
cpe:2.3:a:microsoft:internet_security_and_acceleration_server:2006:sp1:*:*:*:*:*:*
2006CPE matchmatch criteria
cpe:2.3:a:microsoft:internet_security_and_acceleration_server:2006:supportability:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
78.50%
Probability of exploitation in next 30 days
EPSS Percentile
99.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.7850 is in the 100th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

osvdb.org / 53636
docs.microsoft.com / en-us/security-updates/securitybulletins/2009/ms09-016
secunia.com / advisories/34687
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6068
securitytracker.com / id
us-cert.gov / cas/techalerts/TA09-104A.html
US Government Resource
vupen.com / english/advisories/2009/1030