Off-by-one error in the rfc822_output_char function in the RFC822BUFFER routines in the University of Washington (UW) c-client library, as used by the UW IMAP toolkit before imap-2007e and other applications, allows context-dependent attackers to cause a denial of service (crash) via an e-mail message that triggers a buffer overflow.

Buffer overflow in the mail_valid_net_parse_work function in mail.c for Washington's IMAP Server (UW-IMAP) before imap-2004g allows remote attackers to execute arbitrary code via a mailbox name containing a single double-quote (") character without a closing quote, which causes bytes after the double-quote to be copied into a buffer indefinitely.