CVE-2009-2526: Microsoft Windows Server 2008

High severity, CVSS 7.8. EPSS: 81.9% chance of exploitation in the next 30 days.

Microsoft Windows Vista Gold, SP1, and SP2 and Server 2008 Gold and SP2 do not properly validate fields in SMBv2 packets, which allows remote attackers to cause a denial of service (infinite loop and system hang) via a crafted packet to the Server service, aka "SMBv2 Infinite Loop Vulnerability."

Affected products

• Microsoft Windows Server 2008: any version; affected versions not specified
• Microsoft Windows Vista: any version; affected versions not specified

Published 2009-10-14. Last modified 2026-06-16.