IMAP 4.1 BETA, and possibly other versions, does not properly handle the SIGABRT (abort) signal, which allows local users to crash the server (imapd) via certain sequences of commands, which causes a core dump that may contain sensitive password information.

security flaw

Buffer overflows in Washington University imapd 2000a through 2000c could allow local users without shell access to execute code as themselves in certain configurations.