Vulnerability Note VU#951982

Microsoft Windows UDP packet parsing vulnerability

Original Release date: 08 Nov 2011 | Last revised: 08 Nov 2011


A vulnerability in the Microsoft Windows TCP/IP stack could allow an attacker to run arbitrary code in kernel mode or cause a denial-of-service.


Microsoft Windows contains a TCP/IP stack used to process network packets for the operating system. This component contains a vulnerability when processing a continuous flow of specially crafted UDP packets, which results in an integer overflow.


Microsoft Security Bulletin MS11-083 states:

An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.


Apply an update
This issue is addressed in Microsoft Security Bulletin MS11-083.

Block unused UDP ports at the perimeter firewall

Microsoft is recommending states that blocking unused (closed) UDP ports at the perimeter firewall helps protect systems that are behind that firewall from attempts to exploit this vulnerability. Microsoft has additional information on tcp and udp port assignments their website.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate Updated
Microsoft CorporationAffected-08 Nov 2011
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



Thanks to Microsoft Security Response Center for reporting this vulnerability.

This document was written by Michael Orlando.

Other Information

  • CVE IDs: CVE-2011-2013
  • Date Public: 08 Nov 2011
  • Date First Published: 08 Nov 2011
  • Date Last Updated: 08 Nov 2011
  • Severity Metric: 20.66
  • Document Revision: 7


If you have feedback, comments, or additional information about this vulnerability, please send us email.