IIS6

It was announced that the vulnerability of Microsoft's Internet Information Services 6 Web-server software that was posted to the Full Disclosure security mailing list by a security researcher Nikolaos Rangos, was being used for online attacks. 

IIS 6 users who have enabled the WebDAV (Web-based Distributed Authoring and Versioning) protocols, used to share documents via the Web were forecasted to be subject to attacks.