Today the Exchange Team released security fixes for the issue described in bulletin MS13-105. Fixes have been released for the following product levels:

• Exchange 2007 SP3
  Exchange 2007 SP3 Rollup 12, KB2903911, v8.3.342.4
• Exchange 2010 SP2
  Exchange 2010 SP2 Rollup 8, KB2903903, v14.2.390.3
• Exchange 2010 SP3
  Exchange 2010 SP3 Rollup 4, KB2905616, v14.3.174.1
• Exchange 2013 CU2
  Security Update For Exchange 2013 CU2, KB2880833, v15.0.712.31
• Exchange 2013 CU3
  Security Update For Exchange 2013 CU3, KB2880833, v15.0.775.41

Note that depending on the release scheme fixes are either made available through a Rollup or as security fix; the Rollups only address the vulnerabilities mentioned in security bulletin.

Note that this Rollup or security fix replaces MS13-061 – you can install MS13-105 over installations containing MS13-061 (no need to uninstall it first).