The peel_netstring function in cl_netstring.c in the heartbeat subsystem in High-Availability Linux before 1.2.5, and 2.0 before 2.0.7, allows remote attackers to cause a denial of service (crash) via the length parameter in a heartbeat message.
https://exchange.xforce.ibmcloud.com/vulnerabilities/28396
http://www.vupen.com/english/advisories/2006/3288
http://www.ubuntu.com/usn/usn-335-1
http://www.securityfocus.com/bid/19516
http://www.mandriva.com/security/advisories?name=MDKSA-2006:142
http://www.linux-ha.org/_cache/SecurityIssues__sec03.txt
http://www.linux-ha.org/SecurityIssues
http://www.debian.org/security/2006/dsa-1151
http://security.gentoo.org/glsa/glsa-200608-23.xml
http://secunia.com/advisories/21629
http://secunia.com/advisories/21521
http://secunia.com/advisories/21518