{"action":"Upgrade l2tpns to 2.1.21-1 or later.","affected":[{"fixed":"2.1.21-1","introduced":"0"}],"component":"l2tpns","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["2.1.21-1"],"id":"tcs_01M5N8PPRRD1VVAHFYTT6RX7GP","modified_at":"2026-10-22T23:47:32.258172909Z","published_at":"2006-12-12T00:28:00Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2006-5873","https://security-tracker.debian.org/tracker/CVE-2006-5873"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2006-5873","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2006-5873"}],"summary":"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 la"}