The remote host is missing an update to quagga announced via advisory DSA 2497-1.
It was discovered that Quagga, a routing daemon, contains a vulnerability in processing the ORF capability in BGP OPEN messages. A malformed OPEN message from a previously configured BGP peer could cause bgpd to crash, causing a denial of service. For the stable distribution (squeeze), this problem has been fixed in version 0.99.20.1-0+squeeze3. For the testing distribution (wheezy) and the unstable distribution (sid), this problem has been fixed in version 0.99.21-3. We recommend that you upgrade your quagga packages.