Adobe has revised the ColdFusion security hotfix / update that was released last month (February 2011) APSB11-04. The technote states that all users should re-apply the hotfix:
Adobe has received a few issues with the Security Hot fix released on February 8, 2011. For information on these issues, plus updated hotfixes containing fixes to the issues, please revisit the technote link above. All users should re-apply the hotfixes, even if they have applied them already.