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Alert (TA12-265A)

Microsoft Releases Patch for Internet Explorer Exploit

Original release date: September 21, 2012 | Last revised: --

Systems Affected


Microsoft has released Security Bulletin MS12-063 to address the use-after-free vulnerability that has been actively exploited this past week.


Microsoft Internet Explorer versions 6, 7, 8, and 9 are susceptible to a use-after-free vulnerability. This vulnerability is being actively exploited in the wild. Microsoft has released Security Bulletin MS12-063 to patch this vulnerability and four others.

This vulnerability was previously mentioned in US-CERT Alert TA12-262A. Additional information is available in US-CERT Vulnerability Note VU#480095.


A remote, unauthenticated attacker could execute arbitrary code, cause a denial of service, or gain unauthorized access to your files or system.


US-CERT recommends that Internet Explorer users run Windows Update as soon as possible to apply the MS12-063 patch.


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