Mutt does not verify that the smtps server hostname matches the domain name of the subject of an X.509 certificate, which allows man-in-the-middle attackers to spoof an SSL SMTP server via an arbitrary certificate, a different vulnerability than CVE-2009-3766.
https://exchange.xforce.ibmcloud.com/vulnerabilities/66015
http://www.securityfocus.com/bid/46803
http://www.redhat.com/support/errata/RHSA-2011-0959.html
http://securityreason.com/securityalert/8143
http://secunia.com/advisories/44937
http://seclists.org/fulldisclosure/2011/Mar/87
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061461.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061356.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061353.html