The imap4d server for GNU Mailutils 0.5 and 0.6, and other versions before 0.6.90, allows authenticated remote users to cause a denial of service (CPU consumption) via a large range value in the FETCH command.

Integer overflow in the fetchio function of the imap4d server in GNU Mailutils 0.5 and 0.6, and other versions before 0.6.90, allows remote attackers to execute arbitrary code via a partial message request with a large value in the END parameter, which leads to a heap-based buffer overflow.

Format string vulnerability in imap4d server in GNU Mailutils 0.5 and 0.6, and other versions before 0.6.90, allows remote attackers to execute arbitrary code via format string specifiers in the command tag for IMAP commands.

Buffer overflow in the headergetfieldname function in header.c for GNU Mailutils 0.5 and 0.6, and other versions before 0.6.90, allows remote attackers to execute arbitrary code via a crafted e-mail.