Red Hat Security Advisory 2011-1317-01 - The cyrus-imapd packages contain a high-performance mail server with IMAP, POP3, NNTP, and Sieve support. A buffer overflow flaw was found in the cyrus-imapd NNTP server, nntpd. A remote user able to use the nntpd service could use this flaw to crash the nntpd child process or, possibly, execute arbitrary code with the privileges of the cyrus user.
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