Critical updates for IE, Windows, Office, and other products are available. Corporate and home users should promptly install these updates. The Internet Explorer update is rated as “PATCH NOW” by ISC because it patches an exploit currently circulating on malicious sites

https://isc.sans.edu/diary/Microsoft+October+2013+Patch+Tuesday/16760

http://technet.microsoft.com/en-us/security/bulletin/ms13-oct