Vulnerability Monitor

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CVE-2006-5873

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.

Security Impact Summary

CVE-2006-5873 is a security vulnerability that . Impacting 2 products from l2tpns, from debian organizations running these solutions should prioritize assessment and patching.

Historical Context

Originally identified in 2006, this vulnerability predates many modern security frameworks and practices. The vulnerability landscape of that era was characterized by different threat models and less mature defense mechanisms compared to contemporary standards.

Published

2006-12-12T00:28:00.000

Last Modified

2025-04-09T00:30:58.490

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 7.8 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: COMPLETE

Exploitability Score

10.0

Impact Score

6.9

Weaknesses

Type: Primary
NVD-CWE-Other

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	l2tpns	l2tpns	1.1	Yes
Application	l2tpns	l2tpns	2.0.13	Yes
Application	l2tpns	l2tpns	2.1	Yes
Operating System	debian	debian_linux	3.1	Yes

References

http://l2tpns.cvs.sourceforge.net/l2tpns/l2tpns/cluster.c?r1=1.53&r2=1.54 Patch ([email protected])
http://secunia.com/advisories/23230 Patch, Vendor Advisory ([email protected])
http://secunia.com/advisories/23333 Patch, Vendor Advisory ([email protected])
http://sourceforge.net/project/shownotes.php?group_id=97282&release_id=468202 Vendor Advisory ([email protected])
http://www.debian.org/security/2006/dsa-1230 Patch, Vendor Advisory ([email protected])
http://www.securityfocus.com/bid/21443 Vendor Advisory ([email protected])
http://www.vupen.com/english/advisories/2006/4860 ([email protected])
https://exchange.xforce.ibmcloud.com/vulnerabilities/30732 ([email protected])
http://l2tpns.cvs.sourceforge.net/l2tpns/l2tpns/cluster.c?r1=1.53&r2=1.54 Patch (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/23230 Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/23333 Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://sourceforge.net/project/shownotes.php?group_id=97282&release_id=468202 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2006/dsa-1230 Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/21443 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.vupen.com/english/advisories/2006/4860 (af854a3a-2127-422b-91ae-364da2661108)
https://exchange.xforce.ibmcloud.com/vulnerabilities/30732 (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For l2tpns's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.