{"id":"CVE-2023-44203","aliases":["EUVD-2023-48562","GHSA-cjff-m8pq-m7x6"],"status":"published","title":"Junos OS: QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600: Packet flooding will occur when IGMP traffic is sent to an isolated VLAN","description":"An Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600 allows a adjacent attacker to send specific traffic, which leads to packet flooding, resulting in a Denial of Service (DoS).\n\nWhen a specific IGMP packet is received in an isolated VLAN, it is duplicated to all other ports under the primary VLAN, which causes a flood.\n\nThis issue affects QFX5000 series, EX2300, EX3400, EX4100, EX4400 and EX4600 platforms only.\n\nThis issue affects Juniper Junos OS on on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600:\n\n\n\n  *  All versions prior to 20.4R3-S5;\n  *  21.1 versions prior to 21.1R3-S4;\n  *  21.2 versions prior to 21.2R3-S3;\n  *  21.3 versions prior to 21.3R3-S5;\n  *  21.4 versions prior to 21.4R3-S2;\n  *  22.1 versions prior to 22.1R3;\n  *  22.2 versions prior to 22.2R3;\n  *  22.3 versions prior to 22.3R2.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00303,"percentile":0.23261,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-703"],"published":"2023-10-12T23:06:21Z","modified":"2026-06-17T06:27:07Z","products":[{"vendor":"juniper","product":"junos"},{"vendor":"juniper networks","product":"junos os"}],"references":[{"url":"https://supportportal.juniper.net/JSA73169","tags":["vendor-advisory","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-44203"},{"url":"https://github.com/advisories/GHSA-cjff-m8pq-m7x6"}],"sources":{"cve":[{"id":"CVE-2023-44203","title":"Junos OS: QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600: Packet flooding will occur when IGMP traffic is sent to an isolated VLAN","description":"\nAn Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600 allows a adjacent attacker to send specific traffic, which leads to packet flooding, resulting in a Denial of Service (DoS).\n\nWhen a specific IGMP packet is received in an isolated VLAN, it is duplicated to all other ports under the primary VLAN, which causes a flood.\n\nThis issue affects QFX5000 series, EX2300, EX3400, EX4100, EX4400 and EX4600 platforms only.\n\nThis issue affects Juniper Junos OS on on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600:\n\n\n\n  *  All versions prior to 20.4R3-S5;\n  *  21.1 versions prior to 21.1R3-S4;\n  *  21.2 versions prior to 21.2R3-S3;\n  *  21.3 versions prior to 21.3R3-S5;\n  *  21.4 versions prior to 21.4R3-S2;\n  *  22.1 versions prior to 22.1R3;\n  *  22.2 versions prior to 22.2R3;\n  *  22.3 versions prior to 22.3R2.\n\n\n\n\n\n\n","status":"published","published":"2023-10-12T23:06:21.471Z","modified":"2024-09-17T16:09:42.727Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-703"],"updated_at":"2026-11-02T14:35:21.232549Z"}],"euvd":[{"id":"EUVD-2023-48562","description":"\nAn Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600 allows a adjacent attacker to send specific traffic, which leads to packet flooding, resulting in a Denial of Service (DoS).\n\nWhen a specific IGMP packet is received in an isolated VLAN, it is duplicated to all other ports under the primary VLAN, which causes a flood.\n\nThis issue affects QFX5000 series, EX2300, EX3400, EX4100, EX4400 and EX4600 platforms only.\n\nThis issue affects Juniper Junos OS on on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600:\n\n\n\n  *  All versions prior to 20.4R3-S5;\n  *  21.1 versions prior to 21.1R3-S4;\n  *  21.2 versions prior to 21.2R3-S3;\n  *  21.3 versions prior to 21.3R3-S5;\n  *  21.4 versions prior to 21.4R3-S2;\n  *  22.1 versions prior to 22.1R3;\n  *  22.2 versions prior to 22.2R3;\n  *  22.3 versions prior to 22.3R2.\n\n\n\n\n\n\n","status":"published","published":"2023-10-12T23:06:21Z","modified":"2024-09-17T16:09:42Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-03T00:28:21.906955Z"}],"ghsa":[{"id":"GHSA-cjff-m8pq-m7x6","title":"\nAn Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding...","description":"\nAn Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600 allows a adjacent attacker to send specific traffic, which leads to packet flooding, resulting in a Denial of Service (DoS).\n\nWhen a specific IGMP packet is received in an isolated VLAN, it is duplicated to all other ports under the primary VLAN, which causes a flood.\n\nThis issue affects QFX5000 series, EX2300, EX3400, EX4100, EX4400 and EX4600 platforms only.\n\nThis issue affects Juniper Junos OS on on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600:\n\n\n\n  *  All versions prior to 20.4R3-S5;\n  *  21.1 versions prior to 21.1R3-S4;\n  *  21.2 versions prior to 21.2R3-S3;\n  *  21.3 versions prior to 21.3R3-S5;\n  *  21.4 versions prior to 21.4R3-S2;\n  *  22.1 versions prior to 22.1R3;\n  *  22.2 versions prior to 22.2R3;\n  *  22.3 versions prior to 22.3R2.\n\n\n\n\n\n\n","status":"published","published":"2023-10-13T00:30:19Z","modified":"2024-04-04T08:37:17Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-703"],"updated_at":"2026-11-02T14:56:59.652212Z"}],"nvd":[{"id":"CVE-2023-44203","description":"\nAn Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600 allows a adjacent attacker to send specific traffic, which leads to packet flooding, resulting in a Denial of Service (DoS).\n\nWhen a specific IGMP packet is received in an isolated VLAN, it is duplicated to all other ports under the primary VLAN, which causes a flood.\n\nThis issue affects QFX5000 series, EX2300, EX3400, EX4100, EX4400 and EX4600 platforms only.\n\nThis issue affects Juniper Junos OS on on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600:\n\n\n\n  *  All versions prior to 20.4R3-S5;\n  *  21.1 versions prior to 21.1R3-S4;\n  *  21.2 versions prior to 21.2R3-S3;\n  *  21.3 versions prior to 21.3R3-S5;\n  *  21.4 versions prior to 21.4R3-S2;\n  *  22.1 versions prior to 22.1R3;\n  *  22.2 versions prior to 22.2R3;\n  *  22.3 versions prior to 22.3R2.\n\n\n\n\n\n\n","status":"published","published":"2023-10-13T00:15:12.987Z","modified":"2026-06-17T06:27:07.263Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-703"],"updated_at":"2026-11-02T14:08:37.83429Z"}]}}