CVE-2011-1871: Microsoft Windows 7

High severity, CVSS 7.8. EPSS: 38.5% chance of exploitation in the next 30 days.

Tcpip.sys in the TCP/IP stack in Microsoft Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows remote attackers to cause a denial of service (reboot) via a series of crafted ICMP messages, aka "ICMP Denial of Service Vulnerability."

Affected products

• Microsoft Windows 7: affected versions not specified
• Microsoft Windows Server 2008: any version; affected versions not specified; version r2 only
• Microsoft Windows Vista: any version

Published 2011-08-10. Last modified 2026-06-16.