{"id":"CVE-2006-5873","aliases":["DEBIAN-CVE-2006-5873","DSA-1230-1","EUVD-2006-5857","GHSA-548f-88j9-xqq6"],"status":"published","title":"Buffer overflow in the cluster_process_heartbeat function in cluster.c in layer 2 tunneling...","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.","severity":{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.02319,"percentile":0.83566,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2006-12-08T00:00:00Z","modified":"2026-10-22T23:47:32Z","fixes":[{"ecosystem":"Debian:12","package":"l2tpns","fixed_in":["2.1.21-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"l2tpns","fixed_in":["2.1.21-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"l2tpns","fixed_in":["2.1.21-1"],"sources":["osv"]},{"ecosystem":"Debian:3.1","package":"l2tpns","fixed_in":["2.0.14-1sarge1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"l2tpns","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.21-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"l2tpns","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.21-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"l2tpns","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.21-1"}]}]},{"source":"osv","ecosystem":"Debian:3.1","package":"l2tpns","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.14-1sarge1"}]}],"versions":["2.0.14-1"]}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"l2tpns","product":"l2tpns"}],"references":[{"url":"http://secunia.com/advisories/23333","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Patch","Vendor Advisory","advisory","fix"]},{"url":"http://sourceforge.net/project/shownotes.php?group_id=97282\u0026release_id=468202","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory"]},{"url":"http://secunia.com/advisories/23230","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Patch","Vendor Advisory","advisory","fix"]},{"url":"http://l2tpns.cvs.sourceforge.net/l2tpns/l2tpns/cluster.c?r1=1.53\u0026r2=1.54","tags":["x_refsource_CONFIRM","x_transferred","Patch","fix"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/30732","tags":["vdb-entry","x_refsource_XF","x_transferred","web"]},{"url":"http://www.debian.org/security/2006/dsa-1230","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","Patch","Vendor Advisory","advisory","fix"]},{"url":"http://www.vupen.com/english/advisories/2006/4860","tags":["vdb-entry","x_refsource_VUPEN","x_transferred","advisory"]},{"url":"http://www.securityfocus.com/bid/21443","tags":["vdb-entry","x_refsource_BID","x_transferred","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2006-5873"},{"url":"https://github.com/advisories/GHSA-548f-88j9-xqq6"},{"url":"https://security-tracker.debian.org/tracker/CVE-2006-5873","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2006-5873","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.","status":"published","published":"2006-12-12T00:00:00Z","modified":"2024-08-07T20:04:55.651Z","updated_at":"2026-11-02T14:33:48.116532Z"}],"euvd":[{"id":"EUVD-2006-5857","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.","status":"published","published":"2006-12-12T00:00:00Z","modified":"2024-08-07T20:04:55Z","updated_at":"2026-11-03T01:15:45.636176Z"}],"ghsa":[{"id":"GHSA-548f-88j9-xqq6","title":"Buffer overflow in the cluster_process_heartbeat function in cluster.c in layer 2 tunneling...","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.","status":"published","published":"2022-05-01T07:32:38Z","modified":"2023-01-31T05:02:17Z","updated_at":"2026-11-02T14:48:13.960905Z"}],"nvd":[{"id":"CVE-2006-5873","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.","status":"published","published":"2006-12-12T00:28:00Z","modified":"2026-06-16T22:32:03.087Z","cvss":[{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:01:09.852738Z"}],"osv":[{"id":"CVE-2006-5873","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.","status":"published","published":"2006-12-12T00:28:00Z","modified":"2026-04-10T03:37:51.157389Z","updated_at":"2026-11-02T15:43:56.865964Z"},{"id":"DEBIAN-CVE-2006-5873","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.","status":"published","published":"2006-12-12T00:28:00Z","modified":"2026-10-22T23:47:32.258172909Z","updated_at":"2026-11-02T15:45:23.105674Z"},{"id":"DSA-1230-1","title":"l2tpns","status":"published","published":"2006-12-08T00:00:00Z","modified":"2026-03-09T01:01:15.293552Z","updated_at":"2026-11-02T15:46:14.285228Z"}]}}