Buffer overflow in a third-party compression library (UNACEV2.DLL), as used in avast! Antivirus Home/Professional Edition 4.6.665 and Server Edition 4.6.460, allows remote attackers to execute arbitrary code via an ACE archive containing a long filename.
Unknown vulnerability in ALWIL avast! antivirus 4 (4.6.6230) and earlier, when running on Windows NT 4.0, does not properly detect certain viruses.