{
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        "providerMetadata": {
          "dateUpdated": "2024-08-02T07:38:00.699Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "tags": [
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            "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:10.pf.asc"
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            "url": "http://www.openwall.com/lists/oss-security/2023/09/08/5"
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            "url": "http://www.openwall.com/lists/oss-security/2023/09/08/7"
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            "url": "https://security.netapp.com/advisory/ntap-20231221-0009/"
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        ],
        "title": "CVE Program Container"
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    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "pf"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
            {
              "lessThan": "p3",
              "status": "affected",
              "version": "13.2-RELEASE",
              "versionType": "release"
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              "lessThan": "p5",
              "status": "affected",
              "version": "12.4-RELEASE",
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      "credits": [
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          "lang": "en",
          "type": "finder",
          "user": "00000000-0000-4000-9000-000000000000",
          "value": "Enrico Bassetti bassetti@di.uniroma1.it (NetSecurityLab @ Sapienza University of Rome)"
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              "value": "\u003cdiv\u003eIn pf packet processing with a \u0027scrub fragment reassemble\u0027 rule, a packet containing multiple IPv6 fragment headers would be reassembled, and then immediately processed.  That is, a packet with multiple fragment extension headers would not be recognized as the correct ultimate payload. Instead a packet with multiple IPv6 fragment headers would unexpectedly be interpreted as a fragmented packet, rather than as whatever the real payload is.\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003eAs a result, IPv6 fragments may bypass pf firewall rules written on the assumption all fragments have been reassembled and, as a result, be forwarded or processed by the host.\u003c/div\u003e"
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          "value": "In pf packet processing with a \u0027scrub fragment reassemble\u0027 rule, a packet containing multiple IPv6 fragment headers would be reassembled, and then immediately processed.  That is, a packet with multiple fragment extension headers would not be recognized as the correct ultimate payload. Instead a packet with multiple IPv6 fragment headers would unexpectedly be interpreted as a fragmented packet, rather than as whatever the real payload is.\n\n\n\n\nAs a result, IPv6 fragments may bypass pf firewall rules written on the assumption all fragments have been reassembled and, as a result, be forwarded or processed by the host."
        }
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        {
          "descriptions": [
            {
              "cweId": "CWE-167",
              "description": "CWE-167: Improper Handling of Additional Special Element",
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              "type": "CWE"
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        "dateUpdated": "2023-12-21T22:06:15.441Z",
        "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "shortName": "freebsd"
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          "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:10.pf.asc"
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        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20231221-0009/"
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      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "pf incorrectly handles multiple IPv6 fragment headers",
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  "cveMetadata": {
    "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
    "assignerShortName": "freebsd",
    "cveId": "CVE-2023-4809",
    "datePublished": "2023-09-06T19:26:45.833Z",
    "dateReserved": "2023-09-06T17:11:30.349Z",
    "dateUpdated": "2025-02-13T17:18:10.982Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.1"
}