XHA (Linux-HA) on the BlueCat Networks Adonis DNS/DHCP Appliance 5.0.2.8 allows remote attackers to cause a denial of service (heartbeat control process crash) via a UDP packet to port 694. NOTE: this may be the same as CVE-2006-3121.

Multiple format string vulnerabilities in heartbeat 0.4.9 and earlier (claimed as buffer overflows in some sources) allow remote attackers to execute arbitrary code via certain packets to UDP port 694 (incorrectly claimed as TCP in some sources).

heartbeat.c in heartbeat before 2.0.6 sets insecure permissions in a shmget call for shared memory, which allows local users to cause an unspecified denial of service via unknown vectors, possibly during a short time window on startup.