Summary
The remote host seems to be running sympa, an open source mailing list software.
This version of Sympa contains a flaw in the processing of LDAP passwords. An attacker, exploiting this flaw, would need network access to the webserver. A successful attack would crash the sympa application and render it useless.
Solution
Update to version 3.4.4.1 or newer
References
Updated on 2015-03-25
