Is CVE-2006-3121 in the CISA KEV catalog?

No. CVE-2006-3121 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2006-3121?

CVE-2006-3121 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2006-3121?

CVE-2006-3121 has an EPSS score of 12.59% (96th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2006-3121

MEDIUMEPSS 96th pctl

5.0

CVSS v2

NVD

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.

CWE-399

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

12.59%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

http://secunia.com/advisories/21505
http://secunia.com/advisories/21511
http://secunia.com/advisories/21518
http://secunia.com/advisories/21521
http://secunia.com/advisories/21629
http://security.gentoo.org/glsa/glsa-200608-23.xml
http://www.debian.org/security/2006/dsa-1151
http://www.linux-ha.org/SecurityIssues
http://www.linux-ha.org/_cache/SecurityIssues__sec03.txt
http://www.mandriva.com/security/advisories?name=MDKSA-2006:142
http://www.securityfocus.com/bid/19516
http://www.ubuntu.com/usn/usn-335-1
http://www.vupen.com/english/advisories/2006/3288
https://exchange.xforce.ibmcloud.com/vulnerabilities/28396

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-16.