Security Advisory

Microsoft Security Advisory 975497

Vulnerabilities in SMB Could Allow Remote Code Execution

Published: September 08, 2009 | Updated: October 13, 2009

Version: 2.0

General Information

Executive Summary

Microsoft has completed the investigation into a public report of this vulnerability. We have issued MS09-050 to address this issue. For more information about this issue, including download links for an available security update, please review MS09-050. The vulnerability addressed is the SMBv2 Negotiation Vulnerability - CVE-2009-3103.



The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.


  • V1.0 (September 8, 2009): Advisory published.
  • V1.1 (September 17, 2009): Clarified the FAQ, What is SMBv2? Added a link to Microsoft Knowledge Base Article 975497 to provide an automated Microsoft Fix it solution for the workaround, Disable SMB v2.
  • V1.2 (September 23, 2009): Clarified the FAQ, What is Server Message Block Version 2 (SMBv2)? Also clarified the impact of the workaround, Disable SMB v2.
  • V2.0 (October 13, 2009): Advisory updated to reflect publication of security bulletin.

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