{"id":"CVE-2012-2663","aliases":["BELL-CVE-2012-2663","DEBIAN-CVE-2012-2663","EUVD-2012-2646","GHSA-g725-p8m6-82j4","UBUNTU-CVE-2012-2663"],"status":"published","title":"extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn...","description":"extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn rules, which might allow remote attackers to bypass intended firewall restrictions via crafted packets.  NOTE: the CVE-2012-6638 fix makes this issue less relevant.","severity":{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.02737,"percentile":0.86221,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2014-02-15T11:00:00Z","modified":"2026-10-23T17:47:33Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"iptables","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.10-1","1.8.10-2","1.8.10-3","1.8.10-4","1.8.11-1","1.8.11-2","1.8.11-3","1.8.11-4","1.8.12-1","1.8.12-2","1.8.13-1","1.8.9-2"]},{"source":"osv","ecosystem":"Debian:13","package":"iptables","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.11-2","1.8.11-3","1.8.11-4","1.8.12-1","1.8.12-2","1.8.13-1"]},{"source":"osv","ecosystem":"Debian:14","package":"iptables","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.11-2","1.8.11-3","1.8.11-4","1.8.12-1","1.8.12-2","1.8.13-1"]},{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"iptables","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.18-1.1ubuntu1","1.4.20-2","1.4.20-2ubuntu1","1.4.21-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"iptables","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.21-2ubuntu2","1.6.0-2ubuntu3"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"iptables","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.1-2ubuntu1","1.6.1-2ubuntu2","1.6.1-2ubuntu2.1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"iptables","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.3-2ubuntu5","1.8.4-3ubuntu1","1.8.4-3ubuntu2","1.8.4-3ubuntu2.1"]}],"products":[{"vendor":"netfilter","product":"iptables"}],"references":[{"url":"http://www.spinics.net/lists/netfilter-devel/msg21248.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Patch","Third Party Advisory","advisory","fix","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=826702","tags":["x_refsource_CONFIRM","x_transferred","Issue Tracking","Mitigation","Patch","Third Party Advisory","advisory","fix","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2012-2663"},{"url":"https://github.com/advisories/GHSA-g725-p8m6-82j4"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2012-2663","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2012-2663","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2012-2663","tags":["report"]},{"url":"http://www.openwall.com/lists/oss-security/2012/05/30/2","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2012-2663","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2012-2663","description":"extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn rules, which might allow remote attackers to bypass intended firewall restrictions via crafted packets.  NOTE: the CVE-2012-6638 fix makes this issue less relevant.","status":"published","published":"2014-02-15T11:00:00Z","modified":"2024-08-06T19:42:31.646Z","updated_at":"2026-11-02T14:34:50.263482Z"}],"euvd":[{"id":"EUVD-2012-2646","description":"extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn rules, which might allow remote attackers to bypass intended firewall restrictions via crafted packets.  NOTE: the CVE-2012-6638 fix makes this issue less relevant.","status":"published","published":"2014-02-15T11:00:00Z","modified":"2024-08-06T19:42:31Z","updated_at":"2026-11-03T01:56:13.895728Z"}],"ghsa":[{"id":"GHSA-g725-p8m6-82j4","title":"extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn...","description":"extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn rules, which might allow remote attackers to bypass intended firewall restrictions via crafted packets.  NOTE: the CVE-2012-6638 fix makes this issue less relevant.","status":"published","published":"2022-05-13T01:11:51Z","modified":"2023-02-01T05:03:46Z","updated_at":"2026-11-02T14:50:06.238998Z"}],"nvd":[{"id":"CVE-2012-2663","description":"extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn rules, which might allow remote attackers to bypass intended firewall restrictions via crafted packets.  NOTE: the CVE-2012-6638 fix makes this issue less relevant.","status":"published","published":"2014-02-15T14:57:07.423Z","modified":"2026-06-16T23:41:50.013Z","cvss":[{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:02:17.375282Z"}],"osv":[{"id":"BELL-CVE-2012-2663","title":"CVE-2012-2663 does not affect BellSoft software","status":"withdrawn","published":"2014-02-15T14:57:00Z","modified":"2026-01-28T07:20:42.412819Z","cvss":[{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high"}],"updated_at":"2026-11-02T15:28:12.886815Z"},{"id":"CVE-2012-2663","description":"extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn rules, which might allow remote attackers to bypass intended firewall restrictions via crafted packets.  NOTE: the CVE-2012-6638 fix makes this issue less relevant.","status":"published","published":"2014-02-15T14:57:07Z","modified":"2026-04-10T03:42:20.020107Z","updated_at":"2026-11-02T15:43:58.537032Z"},{"id":"DEBIAN-CVE-2012-2663","description":"extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn rules, which might allow remote attackers to bypass intended firewall restrictions via crafted packets.  NOTE: the CVE-2012-6638 fix makes this issue less relevant.","status":"published","published":"2014-02-15T14:57:07.423Z","modified":"2026-10-23T17:47:33.923556918Z","updated_at":"2026-11-02T15:45:24.92418Z"},{"id":"UBUNTU-CVE-2012-2663","description":"extensions/libxt_tcp.c in iptables through 1.4.21 does not match TCP SYN+FIN packets in --syn rules, which might allow remote attackers to bypass intended firewall restrictions via crafted packets.  NOTE: the CVE-2012-6638 fix makes this issue less relevant.","status":"published","published":"2014-02-15T14:57:00Z","modified":"2026-04-22T09:12:49.442159Z","updated_at":"2026-11-02T15:54:06.395274Z"}]}}