The TLS stack in Mono before 3.12.1 makes it easier for remote attackers to conduct cipher-downgrade attacks to EXPORT_RSA ciphers via crafted TLS traffic, related to the "FREAK" issue, a different vulnerability than CVE-2015-0204.
https://www.debian.org/security/2015/dsa-3202
https://mitls.org/pages/attacks/SMACK#freak
https://github.com/mono/mono/commit/9c38772f094168d8bfd5bc73bf8925cd04faad10
https://bugzilla.redhat.com/show_bug.cgi?id=1202869
http://www.ubuntu.com/usn/USN-2547-1
http://www.securityfocus.com/bid/73250
http://www.openwall.com/lists/oss-security/2015/03/17/9
http://www.mono-project.com/news/2015/03/07/mono-tls-vulnerability/