HIGH
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
Published Dec 12, 2006
7.8
HIGHCVSS 2.0
EPSS 2.31%
Description
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.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
7.8 HIGH NVD
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
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
2.31% 0.02312
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.02312
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.31% (0.02312) | 82.78th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.22% (0.02224) | 80.33th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.46% (0.01455) | 79.48th | v4 (v2025.03.14) |
| Dec 17, 2024 | 4.46% (0.04463) | 92.34th | v3 (v2023.03.01) |
| Feb 6, 2024 | 3.02% (0.03018) | 89.95th | v3 (v2023.03.01) |
| Nov 22, 2023 | 3.40% (0.03399) | 90.40th | v3 (v2023.03.01) |
| Oct 15, 2023 | 5.42% (0.05422) | 92.29th | v3 (v2023.03.01) |
| Sep 7, 2023 | 6.34% (0.06339) | 92.74th | v3 (v2023.03.01) |
| Jul 31, 2023 | 6.45% (0.06450) | 92.71th | v3 (v2023.03.01) |
| May 15, 2023 | 6.43% (0.06434) | 92.58th | v3 (v2023.03.01) |
| Mar 7, 2023 | 7.19% (0.07186) | 92.93th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.41% (0.01408) | 72.89th | v2 (v2022.01.01) |
| Mar 2, 2023 | 1.41% (0.01408) | 72.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.41% (0.01408) | 70.87th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.41% (0.01408) | 49.94th | v2 (v2022.01.01) |
Weaknesses (0)
No CWE recorded.
References (8)
- http://l2tpns.cvs.sourceforge.net/l2tpns/l2tpns/cluster.c?r1=1.53&r2=1.54 x_refsource_CONFIRMPatch
- http://secunia.com/advisories/23230 third-party-advisoryx_refsource_SECUNIAPatchVendor Advisory
- http://secunia.com/advisories/23333 third-party-advisoryx_refsource_SECUNIAPatchVendor Advisory
- http://sourceforge.net/project/shownotes.php?group_id=97282&release_id=468202 x_refsource_CONFIRMVendor Advisory
- http://www.debian.org/security/2006/dsa-1230 vendor-advisoryx_refsource_DEBIANPatchVendor Advisory
- http://www.securityfocus.com/bid/21443 vdb-entryx_refsource_BIDVendor Advisory
- http://www.vupen.com/english/advisories/2006/4860 vdb-entryx_refsource_VUPEN
- https://exchange.xforce.ibmcloud.com/vulnerabilities/30732 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://l2tpns.cvs.sourceforge.net/l2tpns/l2tpns/cluster.c?r1=1.53&r2=1.54 | x_refsource_CONFIRMPatch | |
| http://secunia.com/advisories/23230 | third-party-advisoryx_refsource_SECUNIAPatchVendor Advisory | |
| http://secunia.com/advisories/23333 | third-party-advisoryx_refsource_SECUNIAPatchVendor Advisory | |
| http://sourceforge.net/project/shownotes.php?group_id=97282&release_id=468202 | x_refsource_CONFIRMVendor Advisory | |
| http://www.debian.org/security/2006/dsa-1230 | vendor-advisoryx_refsource_DEBIANPatchVendor Advisory | |
| http://www.securityfocus.com/bid/21443 | vdb-entryx_refsource_BIDVendor Advisory | |
| http://www.vupen.com/english/advisories/2006/4860 | vdb-entryx_refsource_VUPEN | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/30732 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Dec 12, 2006
Updated Aug 7, 2024
Reserved Nov 14, 2006
Link CVE-2006-5873
CISA Vulnrichment
Updated n/a