{"action":"Upgrade fail2ban to 0.8.0-4 or later.","affected":[{"fixed":"0.8.0-4","introduced":"0"}],"component":"fail2ban","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["0.8.0-4"],"id":"tcs_01M5N8VK4CBK4CHC73PNDS7FKQ","modified_at":"2026-10-21T17:47:31.880458336Z","published_at":"2007-08-14T00:17:00Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2007-4321","https://security-tracker.debian.org/tracker/CVE-2007-4321"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2007-4321","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2007-4321"}],"summary":"fail2ban 0.8 and earlier does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP a"}