The remote host is missing an update to heartbeat announced via advisory DSA 1151-1. Yan Rong Ge discovered out-of-boundary memory access in heartbeat, the subsystem for High-Availability Linux. This could be used by a remote attacker to cause a denial of service.
For the stable distribution (sarge) this problem has been fixed in version 1.2.3-9sarge6. For the unstable distribution (sid) this problem has been fixed in version 1.2.4-14 and heartbeat-2 2.0.6-2. We recommend that you upgrade your heartbeat packages. https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201151-1