{"id":"CVE-2024-21607","aliases":["EUVD-2024-19255","GHSA-84c9-gp6c-qg45"],"status":"published","title":"Junos OS: MX Series and EX9200 Series: If the \"tcp-reset\" option used in an IPv6 filter, matched packets are accepted instead of rejected","description":"An Unsupported Feature in the UI vulnerability in Juniper Networks Junos OS on MX Series and EX9200 Series allows an unauthenticated, network-based attacker to cause partial impact to the integrity of the device.\n\nIf the \"tcp-reset\" option is added to the \"reject\" action in an IPv6 filter which matches on \"payload-protocol\", packets are permitted instead of rejected. This happens because the payload-protocol match criteria is not supported in the kernel filter causing it to accept all packets without taking any other action. As a fix the payload-protocol match will be treated the same as a \"next-header\" match to avoid this filter bypass.\n\nThis issue doesn't affect IPv4 firewall filters.\n\nThis issue affects Juniper Networks Junos OS on MX Series and EX9200 Series:\n\n\n\n  *  All versions earlier than 20.4R3-S7;\n  *  21.1 versions earlier than 21.1R3-S5;\n  *  21.2 versions earlier than 21.2R3-S5;\n  *  21.3 versions earlier than 21.3R3-S4;\n  *  21.4 versions earlier than 21.4R3-S4;\n  *  22.1 versions earlier than 22.1R3-S2;\n  *  22.2 versions earlier than 22.2R3-S2;\n  *  22.3 versions earlier than 22.3R2-S2, 22.3R3;\n  *  22.4 versions earlier than 22.4R1-S2, 22.4R2-S2, 22.4R3.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00308,"percentile":0.23784,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-447"],"published":"2024-01-12T00:55:07Z","modified":"2026-06-17T07:09:49Z","products":[{"vendor":"juniper","product":"junos"},{"vendor":"juniper networks","product":"junos os"}],"references":[{"url":"https://supportportal.juniper.net/JSA75748","tags":["vendor-advisory","x_transferred","Vendor Advisory"]},{"url":"https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","tags":["technical-description","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-21607"},{"url":"https://github.com/advisories/GHSA-84c9-gp6c-qg45"}],"sources":{"cve":[{"id":"CVE-2024-21607","title":"Junos OS: MX Series and EX9200 Series: If the \"tcp-reset\" option used in an IPv6 filter, matched packets are accepted instead of rejected","description":"\nAn Unsupported Feature in the UI vulnerability in Juniper Networks Junos OS on MX Series and EX9200 Series allows an unauthenticated, network-based attacker to cause partial impact to the integrity of the device.\n\nIf the \"tcp-reset\" option is added to the \"reject\" action in an IPv6 filter which matches on \"payload-protocol\", packets are permitted instead of rejected. This happens because the payload-protocol match criteria is not supported in the kernel filter causing it to accept all packets without taking any other action. As a fix the payload-protocol match will be treated the same as a \"next-header\" match to avoid this filter bypass.\n\nThis issue doesn't affect IPv4 firewall filters.\n\nThis issue affects Juniper Networks Junos OS on MX Series and EX9200 Series:\n\n\n\n  *  All versions earlier than 20.4R3-S7;\n  *  21.1 versions earlier than 21.1R3-S5;\n  *  21.2 versions earlier than 21.2R3-S5;\n  *  21.3 versions earlier than 21.3R3-S4;\n  *  21.4 versions earlier than 21.4R3-S4;\n  *  22.1 versions earlier than 22.1R3-S2;\n  *  22.2 versions earlier than 22.2R3-S2;\n  *  22.3 versions earlier than 22.3R2-S2, 22.3R3;\n  *  22.4 versions earlier than 22.4R1-S2, 22.4R2-S2, 22.4R3.\n\n\n\n\n\n\n","status":"published","published":"2024-01-12T00:55:07.323Z","modified":"2025-06-17T21:09:19.924Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-447"],"updated_at":"2026-11-02T14:34:04.681315Z"}],"euvd":[{"id":"EUVD-2024-19255","description":"\nAn Unsupported Feature in the UI vulnerability in Juniper Networks Junos OS on MX Series and EX9200 Series allows an unauthenticated, network-based attacker to cause partial impact to the integrity of the device.\n\nIf the \"tcp-reset\" option is added to the \"reject\" action in an IPv6 filter which matches on \"payload-protocol\", packets are permitted instead of rejected. This happens because the payload-protocol match criteria is not supported in the kernel filter causing it to accept all packets without taking any other action. As a fix the payload-protocol match will be treated the same as a \"next-header\" match to avoid this filter bypass.\n\nThis issue doesn't affect IPv4 firewall filters.\n\nThis issue affects Juniper Networks Junos OS on MX Series and EX9200 Series:\n\n\n\n  *  All versions earlier than 20.4R3-S7;\n  *  21.1 versions earlier than 21.1R3-S5;\n  *  21.2 versions earlier than 21.2R3-S5;\n  *  21.3 versions earlier than 21.3R3-S4;\n  *  21.4 versions earlier than 21.4R3-S4;\n  *  22.1 versions earlier than 22.1R3-S2;\n  *  22.2 versions earlier than 22.2R3-S2;\n  *  22.3 versions earlier than 22.3R2-S2, 22.3R3;\n  *  22.4 versions earlier than 22.4R1-S2, 22.4R2-S2, 22.4R3.\n\n\n\n\n\n\n","status":"published","published":"2024-01-12T00:55:07Z","modified":"2025-06-17T21:09:19Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:32:21.531807Z"}],"ghsa":[{"id":"GHSA-84c9-gp6c-qg45","title":"\nAn Unsupported Feature in the UI vulnerability in Juniper Networks Junos OS on MX Series and...","description":"\nAn Unsupported Feature in the UI vulnerability in Juniper Networks Junos OS on MX Series and EX9200 Series allows an unauthenticated, network-based attacker to cause partial impact to the integrity of the device.\n\nIf the \"tcp-reset\" option is added to the \"reject\" action in an IPv6 filter which matches on \"payload-protocol\", packets are permitted instead of rejected. This happens because the payload-protocol match criteria is not supported in the kernel filter causing it to accept all packets without taking any other action. As a fix the payload-protocol match will be treated the same as a \"next-header\" match to avoid this filter bypass.\n\nThis issue doesn't affect IPv4 firewall filters.\n\nThis issue affects Juniper Networks Junos OS on MX Series and EX9200 Series:\n\n\n\n  *  All versions earlier than 20.4R3-S7;\n  *  21.1 versions earlier than 21.1R3-S5;\n  *  21.2 versions earlier than 21.2R3-S5;\n  *  21.3 versions earlier than 21.3R3-S4;\n  *  21.4 versions earlier than 21.4R3-S4;\n  *  22.1 versions earlier than 22.1R3-S2;\n  *  22.2 versions earlier than 22.2R3-S2;\n  *  22.3 versions earlier than 22.3R2-S2, 22.3R3;\n  *  22.4 versions earlier than 22.4R1-S2, 22.4R2-S2, 22.4R3.\n\n\n\n\n\n\n","status":"published","published":"2024-01-12T03:30:49Z","modified":"2024-01-12T03:30:55Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-447"],"updated_at":"2026-11-02T14:55:23.490471Z"}],"nvd":[{"id":"CVE-2024-21607","description":"\nAn Unsupported Feature in the UI vulnerability in Juniper Networks Junos OS on MX Series and EX9200 Series allows an unauthenticated, network-based attacker to cause partial impact to the integrity of the device.\n\nIf the \"tcp-reset\" option is added to the \"reject\" action in an IPv6 filter which matches on \"payload-protocol\", packets are permitted instead of rejected. This happens because the payload-protocol match criteria is not supported in the kernel filter causing it to accept all packets without taking any other action. As a fix the payload-protocol match will be treated the same as a \"next-header\" match to avoid this filter bypass.\n\nThis issue doesn't affect IPv4 firewall filters.\n\nThis issue affects Juniper Networks Junos OS on MX Series and EX9200 Series:\n\n\n\n  *  All versions earlier than 20.4R3-S7;\n  *  21.1 versions earlier than 21.1R3-S5;\n  *  21.2 versions earlier than 21.2R3-S5;\n  *  21.3 versions earlier than 21.3R3-S4;\n  *  21.4 versions earlier than 21.4R3-S4;\n  *  22.1 versions earlier than 22.1R3-S2;\n  *  22.2 versions earlier than 22.2R3-S2;\n  *  22.3 versions earlier than 22.3R2-S2, 22.3R3;\n  *  22.4 versions earlier than 22.4R1-S2, 22.4R2-S2, 22.4R3.\n\n\n\n\n\n\n","status":"published","published":"2024-01-12T01:15:49.057Z","modified":"2026-06-17T07:09:49.443Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-447"],"updated_at":"2026-11-02T14:09:30.070039Z"}]}}