The remote host is missing an update to the system as announced in the referenced advisory.

Update your system with the appropriate patches or software upgrades. http://www.fetchmail.info/fetchmail-SA-2011-01.txt https://gitorious.org/fetchmail/fetchmail/commit/7dc67b8cf06f74aa57525279940e180c99701314 http://www.vuxml.org/freebsd/f7d838f2-9039-11e0-a051-080027ef73ec.html

The following package is affected: fetchmail CVE-2011-1947 fetchmail 5.9.9 through 6.3.19 does not properly limit the wait time after issuing a (1) STARTTLS or (2) STLS request, which allows remote servers to cause a denial of service (application hang) by acknowledging the request but not sending additional packets.