ACMS 4.3 and 4.4 in OpenVMS Alpha 7.2 and 7.3 does not properly use process privileges, which allows attackers to access data.
http://www.securityfocus.com/bid/4184
http://www.iss.net/security_center/static/8306.php
http://ftp.support.compaq.com/patches/.new/html/SSRT0813.shtml