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Vulnerability record · CVE-2011-1871 · published 10 August 2011

CVE-2011-1871: Microsoft windows 7 vulnerability

Microsoft · Windows 7

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."

7.8 CVSS 2.0 High EPSS 38% · top 1.5% CWE-399 · CWE-399
7.8CVSS 2.0 base score
38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

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."

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.us-cert.gov/cas/techalerts/TA11-221A.html US Government Resource
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-064
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12971
http://www.us-cert.gov/cas/techalerts/TA11-221A.html US Government Resource
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-064
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12971

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2011-1871), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.