The mod_tls module in ProFTPD before 1.3.5b and 1.3.6 before 1.3.6rc2 does not properly handle the TLSDHParamFile directive, which might cause a weaker than intended Diffie-Hellman (DH) key to be used and consequently allow attackers to have unspecified impact via unknown vectors.
http://www.openwall.com/lists/oss-security/2016/03/11/3
http://www.openwall.com/lists/oss-security/2016/03/11/14
http://proftpd.org/docs/NEWS-1.3.6rc2
http://proftpd.org/docs/NEWS-1.3.5b
http://lists.opensuse.org/opensuse-updates/2016-06/msg00045.html
http://lists.opensuse.org/opensuse-updates/2016-05/msg00080.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/179905.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/179143.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/179109.html