CVE-2009-1926

Severity: high (CVSS 7.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 35.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2009-09-08 · updated 2026-06-16

Description

Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 Gold and SP2 allow remote attackers to cause a denial of service (TCP outage) via a series of TCP sessions that have pending data and a (1) small or (2) zero receive window size, and remain in the FIN-WAIT-1 or FIN-WAIT-2 state indefinitely, aka "TCP/IP Orphaned Connections Vulnerability."

Affected products

Microsoft Windows 2000: all versions
Microsoft Windows Server 2003: all versions
Microsoft Windows Server 2008: all versions
Microsoft Windows Vista: all versions
Microsoft Windows XP Service Pack 3: all versions

References

http://osvdb.org/57797
http://www.recurity-labs.com/content/pub/Microsoft_Windows_CVE-2009-1926
http://www.securityfocus.com/archive/1/506331/100/0/threaded
http://www.securityfocus.com/bid/36269
http://www.us-cert.gov/cas/techalerts/TA09-251A.html
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-048
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5965
http://osvdb.org/57797
http://www.recurity-labs.com/content/pub/Microsoft_Windows_CVE-2009-1926
http://www.securityfocus.com/archive/1/506331/100/0/threaded
http://www.securityfocus.com/bid/36269
http://www.us-cert.gov/cas/techalerts/TA09-251A.html

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