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            "url": "https://kb.juniper.net/JSA11265"
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        "title": "CVE Program Container"
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          "platforms": [
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          "value": "A traffic classification vulnerability in Juniper Networks Junos OS on the SRX Series Services Gateways may allow an attacker to bypass Juniper Deep Packet Inspection (JDPI) rules and access unauthorized networks or resources, when \u0027no-syn-check\u0027 is enabled on the device. JDPI incorrectly classifies out-of-state asymmetric TCP flows as the dynamic-application INCONCLUSIVE instead of UNKNOWN, which is more permissive, causing the firewall to allow traffic to be forwarded that should have been denied. This issue only occurs when \u0027set security flow tcp-session no-syn-check\u0027 is configured on the device. This issue affects Juniper Networks Junos OS on SRX Series: 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.1 versions prior to 19.1R2-S3, 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R2-S5, 19.4R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R3-S1; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2. This issue does not affect Juniper Networks Junos OS versions prior to 18.4R1."
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          "value": "The following software releases have been updated to resolve this specific issue: Junos OS 18.4R2-S9, 18.4R3-S9, 19.1R2-S3, 19.1R3-S6, 19.2R1-S7, 19.2R3-S3, 19.3R2-S6, 19.3R3-S2, 19.4R2-S5, 19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R3-S1, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1, and all subsequent releases."
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      "source": {
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        "defect": [
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        "discovery": "USER"
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      "title": "Junos OS: SRX Series: Traffic classification vulnerability when \u0027no-syn-check\u0027 is enabled",
      "workarounds": [
        {
          "lang": "en",
          "value": "Any of the following workarounds will mitigate this issue:\n\n1. Remove \u0027security flow tcp-session no-syn-check\u0027 from the configuration.\n\n2: Enable AppID cache configuration:\n  set services application-identification application-system-cache security-services"
        }
      ],
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          "TITLE": "Junos OS: SRX Series: Traffic classification vulnerability when \u0027no-syn-check\u0027 is enabled"
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    "dateReserved": "2021-12-21T00:00:00.000Z",
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