CVE-2006-5873
Buffer overflow in the cluster_process_heartbeat function in cluster.c in layer 2 tunneling...
Buffer overflow in the cluster_process_heartbeat function in cluster.c in layer 2 tunneling protocol network server (l2tpns) before 2.1.21 allows remote attackers to cause a denial of service via a large heartbeat packet.
Exploit likelihood
What each source reports
NVD Score used
Buffer overflow in the cluster_process_heartbeat function in cluster.c in layer 2 tunneling protocol network server (l2tpns) before 2.1.21 allows remote attackers to cause a denial of service via a large heartbeat packet.
- Record
CVE-2006-5873- CVSS 2.0
- 7.8 High
AV:N/AC:L/Au:N/C:N/I:N/A:C - Updated
- 2026-11-02
CVE List No score
Buffer overflow in the cluster_process_heartbeat function in cluster.c in layer 2 tunneling protocol network server (l2tpns) before 2.1.21 allows remote attackers to cause a denial of service via a large heartbeat packet.
- Record
CVE-2006-5873- Updated
- 2026-11-02
EUVDEUVD-2006-5857 No score
Buffer overflow in the cluster_process_heartbeat function in cluster.c in layer 2 tunneling protocol network server (l2tpns) before 2.1.21 allows remote attackers to cause a denial of service via a large heartbeat packet.
- Record
EUVD-2006-5857- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-548f-88j9-xqq6 No score
Buffer overflow in the cluster_process_heartbeat function in cluster.c in layer 2 tunneling...
Buffer overflow in the cluster_process_heartbeat function in cluster.c in layer 2 tunneling protocol network server (l2tpns) before 2.1.21 allows remote attackers to cause a denial of service via a large heartbeat packet.
- Record
GHSA-548f-88j9-xqq6- Updated
- 2026-11-02
OSV No score
Buffer overflow in the cluster_process_heartbeat function in cluster.c in layer 2 tunneling protocol network server (l2tpns) before 2.1.21 allows remote attackers to cause a denial of service via a large heartbeat packet.
- Record
CVE-2006-5873- Updated
- 2026-11-02
OSVDEBIAN-CVE-2006-5873 No score
Buffer overflow in the cluster_process_heartbeat function in cluster.c in layer 2 tunneling protocol network server (l2tpns) before 2.1.21 allows remote attackers to cause a denial of service via a large heartbeat packet.
- Record
DEBIAN-CVE-2006-5873- Updated
- 2026-11-02
Affected products
Affected packages
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2006-5873 is a high vulnerability (CVSS 7.8) in L2tpns, published December 8, 2006. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.32%, the 83rd percentile. Fixed in l2tpns 2.1.21-1.