CVE-2006-3121

High-Availability Linux <2.0.7 - DoS

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2006-3121. PoCs published by Yan Rong Ge.

AI-analyzed exploit summary This exploit sends a malformed UDP packet to the Linux-HA Heartbeat service, triggering a denial-of-service condition by crashing the master control process. The payload consists of a specific string pattern designed to exploit a vulnerability in the service.

Description

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.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Yan Rong Ge · textdoslinux
https://www.exploit-db.com/exploits/28386

This exploit sends a malformed UDP packet to the Linux-HA Heartbeat service, triggering a denial-of-service condition by crashing the master control process. The payload consists of a specific string pattern designed to exploit a vulnerability in the service.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Linux-HA Heartbeat (version not specified)
No auth needed
Prerequisites: Network access to the target's UDP port 694 · Linux-HA Heartbeat service running on the target
mistral-large-3 · analyzed Feb 16, 2026 Full analysis →

References (14)

Core 14
Core References
Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/21629
Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/21511
Third Party Advisory vendor-advisory x_refsource_gentoo
http://security.gentoo.org/glsa/glsa-200608-23.xml
Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/21505
Patch vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/19516
Various Sources x_refsource_confirm
http://www.linux-ha.org/_cache/SecurityIssues__sec03.txt
Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/21518
Vendor Advisory vendor-advisory x_refsource_mandriva
http://www.mandriva.com/security/advisories?name=MDKSA-2006:142
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/28396
Patch vendor-advisory x_refsource_debian
http://www.debian.org/security/2006/dsa-1151
Patch x_refsource_confirm
http://www.linux-ha.org/SecurityIssues
Vendor Advisory vdb-entry x_refsource_vupen
http://www.vupen.com/english/advisories/2006/3288
Vendor Advisory vendor-advisory x_refsource_ubuntu
http://www.ubuntu.com/usn/usn-335-1
Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/21521

Scores

EPSS 0.1335
EPSS Percentile 96.0%

Details

CWE
CWE-399
Status published
Products (8)
high_availability_linux_project/heartbeat 1.2.3
high_availability_linux_project/heartbeat 1.2.4
high_availability_linux_project/heartbeat 2.0.1
high_availability_linux_project/heartbeat 2.0.2
high_availability_linux_project/heartbeat 2.0.3
high_availability_linux_project/heartbeat 2.0.4
high_availability_linux_project/heartbeat 2.0.5
high_availability_linux_project/heartbeat 2.0.6
Published Aug 17, 2006
Tracked Since Feb 18, 2026