{"id":"CVE-2024-21595","aliases":["EUVD-2024-19243","GHSA-38gm-m6ww-x846"],"status":"published","title":"Junos OS: EX4100, EX4400, EX4600, QFX5000 Series: A high rate of specific ICMP traffic will cause the PFE to hang","description":"An Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends high rate of specific ICMP traffic to a device with VXLAN configured, this causes a deadlock of the PFE and results in the device becoming unresponsive. A manual restart will be required to recover the device.\n\nThis issue only affects EX4100, EX4400, EX4600, QFX5000 Series devices.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n  *  21.4R3 versions earlier than 21.4R3-S4;\n  *  22.1R3 versions earlier than 22.1R3-S3;\n  *  22.2R2 versions earlier than 22.2R3-S1;\n  *  22.3 versions earlier than 22.3R2-S2, 22.3R3;\n  *  22.4 versions earlier than 22.4R2;\n  *  23.1 versions earlier than 23.1R2.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00538,"percentile":0.45673,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1286"],"published":"2024-01-12T00:52:35Z","modified":"2026-06-17T07:09:47Z","products":[{"vendor":"juniper","product":"junos"},{"vendor":"juniper networks","product":"junos os"}],"references":[{"url":"https://advisory.juniper.net/JSA75734","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:N/VA:H/SC:N/SI:N/SA:N","tags":["technical-description","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-21595"},{"url":"https://github.com/advisories/GHSA-38gm-m6ww-x846"}],"sources":{"cve":[{"id":"CVE-2024-21595","title":"Junos OS: EX4100, EX4400, EX4600, QFX5000 Series: A high rate of specific ICMP traffic will cause the PFE to hang","description":"\nAn Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends high rate of specific ICMP traffic to a device with VXLAN configured, this causes a deadlock of the PFE and results in the device becoming unresponsive. A manual restart will be required to recover the device.\n\nThis issue only affects EX4100, EX4400, EX4600, QFX5000 Series devices.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n  *  21.4R3 versions earlier than 21.4R3-S4;\n  *  22.1R3 versions earlier than 22.1R3-S3;\n  *  22.2R2 versions earlier than 22.2R3-S1;\n  *  22.3 versions earlier than 22.3R2-S2, 22.3R3;\n  *  22.4 versions earlier than 22.4R2;\n  *  23.1 versions earlier than 23.1R2.\n\n\n\n\n\n\n","status":"published","published":"2024-01-12T00:52:35.433Z","modified":"2024-09-03T18:13:05.922Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-1286"],"updated_at":"2026-11-02T14:34:04.681315Z"}],"euvd":[{"id":"EUVD-2024-19243","description":"\nAn Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends high rate of specific ICMP traffic to a device with VXLAN configured, this causes a deadlock of the PFE and results in the device becoming unresponsive. A manual restart will be required to recover the device.\n\nThis issue only affects EX4100, EX4400, EX4600, QFX5000 Series devices.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n  *  21.4R3 versions earlier than 21.4R3-S4;\n  *  22.1R3 versions earlier than 22.1R3-S3;\n  *  22.2R2 versions earlier than 22.2R3-S1;\n  *  22.3 versions earlier than 22.3R2-S2, 22.3R3;\n  *  22.4 versions earlier than 22.4R2;\n  *  23.1 versions earlier than 23.1R2.\n\n\n\n\n\n\n","status":"published","published":"2024-01-12T00:52:35Z","modified":"2024-09-03T18:13:05Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:56:05.515988Z"}],"ghsa":[{"id":"GHSA-38gm-m6ww-x846","title":"\nAn Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding...","description":"\nAn Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends high rate of specific ICMP traffic to a device with VXLAN configured, this causes a deadlock of the PFE and results in the device becoming unresponsive. A manual restart will be required to recover the device.\n\nThis issue only affects EX4100, EX4400, EX4600, QFX5000 Series devices.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n  *  21.4R3 versions earlier than 21.4R3-S4;\n  *  22.1R3 versions earlier than 22.1R3-S3;\n  *  22.2R2 versions earlier than 22.2R3-S1;\n  *  22.3 versions earlier than 22.3R2-S2, 22.3R3;\n  *  22.4 versions earlier than 22.4R2;\n  *  23.1 versions earlier than 23.1R2.\n\n\n\n\n\n\n","status":"published","published":"2024-01-12T03:30:48Z","modified":"2024-01-12T03:30:55Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1286"],"updated_at":"2026-11-02T14:55:23.490471Z"}],"nvd":[{"id":"CVE-2024-21595","description":"\nAn Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends high rate of specific ICMP traffic to a device with VXLAN configured, this causes a deadlock of the PFE and results in the device becoming unresponsive. A manual restart will be required to recover the device.\n\nThis issue only affects EX4100, EX4400, EX4600, QFX5000 Series devices.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n  *  21.4R3 versions earlier than 21.4R3-S4;\n  *  22.1R3 versions earlier than 22.1R3-S3;\n  *  22.2R2 versions earlier than 22.2R3-S1;\n  *  22.3 versions earlier than 22.3R2-S2, 22.3R3;\n  *  22.4 versions earlier than 22.4R2;\n  *  23.1 versions earlier than 23.1R2.\n\n\n\n\n\n\n","status":"published","published":"2024-01-12T01:15:47.063Z","modified":"2026-06-17T07:09:47.29Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-1286"],"updated_at":"2026-11-02T14:09:30.070039Z"}]}}