HP Security Bulletin – Several potential security vulnerabilities have been reported on HP Tru64 UNIX systems using an IPsec tunnel mode configuration which uses ESP without authentication. When running this configuration a remote attacker could force an error such that a portion of a plain-text message can be intercepted by the attacker.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/39213/SSRT5957.txt
Source: https://packetstormsecurity.com/files/39213/SSRT5957.txt.html