Summary
The remote host is running SYMPA, an open source mailing list software.
This version of Sympa has a flaw in one of it's scripts (wwsympa.pl) which would allow a remote attacker to overflow the sympa server. Specifically, within the cgi script wwsympa.pl is a do_search_list function which fails to perform bounds checking. An attacker, passing a specially formatted long string to this function, would be able to crash the remote sympa server. At the time of this writing, the attack is only known to cause a Denial of Service (DoS).
Solution
Update to version 4.1.2 or newer
References
Updated on 2015-03-25
