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Vulnerability Score 7.5 7.5
CVE Id CVE-2009-2511
Last Modified 21 Aug 2010 01:34:00
Published 14 Oct 2009 06:30:01
Confidentiality Impact PARTIAL PARTIAL
Integrity Impact PARTIAL PARTIAL
Availability Impact PARTIAL PARTIAL
Access Vector NETWORK
Access Complexity LOW
Authentication NONE



Integer overflow in the CryptoAPI component in Microsoft Windows 2000 SP4, Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista Gold, SP1, and SP2, Windows Server 2008 Gold, SP2, and R2, and Windows 7 allows man-in-the-middle attackers to spoof arbitrary SSL servers and other entities via an X.509 certificate that has a malformed ASN.1 Object Identifier (OID) and was issued by a legitimate Certification Authority, aka "Integer Overflow in X.509 Object Identifiers Vulnerability."

Vulnerable Systems

Operating System

  • Microsoft Windows 2000

  • Microsoft Windows 7 -

  • Microsoft Windows Server 2003

  • Microsoft Windows Server 2008

  • Microsoft Windows Vista

  • Microsoft Windows Xp


CERT - TA09-286A

MS - MS09-056

Last Updated: 27 May 2016 10:50:56