This attack could pose a serious security threat. You should take immediate action to stop any damage or prevent further damage from happening.
This signature detects an attempt to exploit a buffer overflow vulnerability in IrfanView Formats PlugIn.
Formats PlugIn is a plugin to process rare image files for the IrfanView image viewer application.
Formats PlugIn is prone to a remote stack-based buffer-overflow vulnerability because it fails to properly bounds-check user-supplied input before copying it to an insufficiently sized memory buffer. Specifically, the issue occurs when processing TTF font names from a specially crafted font file.
Successful exploits allow remote attackers to execute arbitrary code in the context of the vulnerable application. Failed exploit attempts likely result in denial-of-service conditions.