Question
Cert Advisory 97.09 provides details of vulnerability in some IMAP servers.
Answer
This Cert Advisory relates only to IMAP servers running on the Unix operating system. The IMAP server provided as part of GMS Mail (version 4 and onwards) is not open to these attacks.
You may however see evidence in your IMAP logs of attempts to penetrate IMAP servers, these will typically be shown as connections to the IMAP server that do not do anything other than simply time out.
Keywords:Cert Advisory IMAP