The vulnerability is caused due to a format string error when generating the scan report file. This can potentially be exploited to execute arbitrary code when a file or directory containing format string specifiers in its name (e.g. %.8X%.8X) is scanned.
BitDefender was notified on September 16, 2005 by the SecuBox team on the existence of a format string vulnerability in BitDefender products.
Fixes for BitDefender v7.x, BitDefender v8.x and BitDefender 9 Internet Security were released September 26, 2005.
Fixes for BitDefender 9 Professional Plus and BitDefender 9 Standard were released October 4, 2005.
Installed BitDefender solutions were updated automatically through the regular update function.
Source : http://kb.bitdefender.com/KB261-en--Filename-Format-String-Vulnerability.html