Multiple security issues have been discovered in cyrus-imapd, a highly scalable mail system designed for use in enterprise environments. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2011-3208 Coverity discovered a stack-based buffer overflow in the NNTP server implementation of cyrus-imapd. An attacker can exploit this flaw via several crafted NNTP commands to execute arbitrary code. CVE-2011-3372 Stefan Cornelius of Secunia Research discovered that the command processing of the NNTP server implementation of cyrus-imapd is not properly implementing access restrictions for certain commands and is not checking for a complete, successful authentication. An attacker can use this flaw to bypass access restrictions for some commands and, e.g. exploit CVE-2011-3208 without proper authentication.