CVE-2006-2918
The Lanap BotDetect APS.NET CAPTCHA component before 1.5.4.0 stores the UUID and hash for a CAPTCHA in the ViewState of a page, which makes it easier for remote attackers to conduct automated attacks by "replaying the ViewState for a known number."
Date published : 2006-06-23
http://www.securityfocus.com/bid/18315
http://www.securityfocus.com/archive/1/438159/100/0/threaded