Winamp is a media player for Windows-based PCs, written by Nullsoft, now a subsidiary of AOL. It is proprietary freeware/shareware, multi-format, extensible with plug-ins and skins, and is noted for its graphical sound visualization, playlist, and media library features.
Winamp 5.581 suffers from a dll hijacking vulnerability that enables the attacker to execute arbitrary code on a local level. The vulnerable extensions are .669, .aac, .aiff, .amf, .au, .avr, .b4s, .caf and .cda thru wnaspi32.dll and dwmapi.dll libraries.