A vulnerability has been found and corrected in cyrus-imapd: Buffer overflow in the SIEVE script component in cyrus-imapd in Cyrus IMAP Server 2.2.13 and 2.3.14 allows local users to execute arbitrary code and read or modify arbitrary messages via a crafted SIEVE script, related to the incorrect use of the sizeof operator for determining buffer length, combined with an integer signedness error . This update provides a solution to this vulnerability.