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iptables — security advisory
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.
- Products
- iptables
- Affected 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
- Fixed versions
- Not specified
- CVEs
- CVE-2012-2663
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 23:04 UTC · Revision 1
Source evidence
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.
osv:DEBIAN-CVE-2012-2663
iptables
Fixed versions: Not specified
iptables
Fixed versions: Not specified
iptables
Fixed versions: Not specified
Complete source record
{
"id": "b882017a635fb752058901bd5c2e14d7ae11f80f46894184b14c3c2bbf3a73f2",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2012-2663",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2012-2663",
"summary": "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.",
"evidence": "osv:DEBIAN-CVE-2012-2663",
"products": [
{
"name": {
"value": "iptables",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.8.10-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.10-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.10-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.10-4",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.11-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.11-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.11-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.11-4",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.12-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.12-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.13-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.8.9-2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "iptables",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.8.11-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.8.11-3",
"evidence": "/affected/1/versions"
},
{
"value": "1.8.11-4",
"evidence": "/affected/1/versions"
},
{
"value": "1.8.12-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.8.12-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.8.13-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "iptables",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.8.11-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.8.11-3",
"evidence": "/affected/2/versions"
},
{
"value": "1.8.11-4",
"evidence": "/affected/2/versions"
},
{
"value": "1.8.12-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.8.12-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.8.13-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "unknown",
"structured": {
"id": "DEBIAN-CVE-2012-2663",
"aliases": [
"DEBIAN-CVE-2012-2663"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "iptables",
"purl": "pkg:deb/debian/iptables?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2012-2663.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "iptables",
"purl": "pkg:deb/debian/iptables?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2012-2663.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "iptables",
"purl": "pkg:deb/debian/iptables?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2012-2663.json"
},
"ecosystem_specific": {
"urgency": "unimportant"
}
}
],
"modified": "2026-10-23T17:47:33.923556918Z",
"provider": "osv",
"upstream": [
"CVE-2012-2663"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2012-2663"
]
},
"related_cves": [
{
"value": "CVE-2012-2663",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 417651,
"published_at": "2014-02-15T14:57:07.423+00:00"
}