CVE-2023-6534 (GCVE-0-2023-6534)
Vulnerability from cvelistv5
Published
2023-12-13 08:12
Modified
2025-02-13 17:26
Severity ?
Summary
In versions of FreeBSD 14.0-RELEASE before 14-RELEASE-p2, FreeBSD 13.2-RELEASE before 13.2-RELEASE-p7 and FreeBSD 12.4-RELEASE before 12.4-RELEASE-p9, the pf(4) packet filter incorrectly validates TCP sequence numbers.  This could allow a malicious actor to execute a denial-of-service attack against hosts behind the firewall.
Impacted products
Vendor Product Version
FreeBSD FreeBSD Version: 14.0-RELEASE
Version: 13.2-RELEASE
Version: 12.4-RELEASE
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      "datePublic": "2023-12-05T22:00:00.000Z",
      "descriptions": [
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          "lang": "en",
          "value": "In versions of FreeBSD 14.0-RELEASE before 14-RELEASE-p2, FreeBSD 13.2-RELEASE before 13.2-RELEASE-p7 and FreeBSD 12.4-RELEASE before 12.4-RELEASE-p9, the pf(4) packet filter incorrectly validates TCP sequence numbers. \u00a0This could allow a malicious actor to execute a denial-of-service attack against hosts behind the firewall."
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      "providerMetadata": {
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      "source": {
        "discovery": "UNKNOWN"
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      "title": "TCP spoofing vulnerability in pf(4)",
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    "datePublished": "2023-12-13T08:12:14.616Z",
    "dateReserved": "2023-12-05T19:03:31.535Z",
    "dateUpdated": "2025-02-13T17:26:26.737Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.1"
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