IrfanView is "a very fast, small, compact and innovative FREEWARE (for non-commercial use) graphic viewer for Windows 9x/ME/NT/2000/XP/2003/Vista. It is trying to be simple for beginners and powerful for professionals.". Secunia Research has discovered a vulnerability in IrfanView, which can be exploited by malicious people to compromise a user's system.

http://www.securiteam.com/windowsntf...V00B20K0M.html