THREATPORT/VULNERABILITY/CVE-2006-3121
MEDIUM SEVERITY

CVE-2006-3121

Heartbeat vulnerability

CVSS
5.0
EPSS
13.3%
EPSS pct
96th
Exploited
No known
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.
Affected vendor
High Availability Linux Project
Affected product
Heartbeat
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness type (CWE)
Published
2006-08-17

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to availability.

Its EPSS score of 13.3% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2006-3121

  • Confirm whether High Availability Linux Project Heartbeat is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2006-3121.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2006-3121

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2006-3121 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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