{"id":"CVE-2024-21596","aliases":["EUVD-2024-19244","GHSA-rj2r-9q5p-4c4w"],"status":"published","title":"Junos OS and Junos OS Evolved: A specific BGP UPDATE message will cause a crash in the backup Routing Engine in NSR-enabled devices","description":"A Heap-based Buffer Overflow vulnerability in the Routing Protocol Daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network based attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends a specific BGP UPDATE message to the device, this will cause a memory overwrite and therefore an RPD crash and restart in the backup Routing Engine (RE). Continued receipt of these packets will cause a sustained Denial of Service (DoS) condition in the backup RE.\n\nThe primary RE is not impacted by this issue and there is no impact on traffic.\n\nThis issue only affects devices with NSR enabled.\n\nNote: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability.\nThis issue requires an attacker to have an established BGP session to a system affected by the issue. This issue affects both eBGP and iBGP implementations.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n  *  All versions earlier than 20.4R3-S9;\n  *  21.2 versions earlier than 21.2R3-S7;\n  *  21.3 versions earlier than 21.3R3-S5;\n  *  21.4 versions earlier than 21.4R3-S5;\n  *  22.1 versions earlier than 22.1R3-S4;\n  *  22.2 versions earlier than 22.2R3-S2;\n  *  22.3 versions earlier than 22.3R3-S1;\n  *  22.4 versions earlier than 22.4R2-S2, 22.4R3;\n  *  23.1 versions earlier than 23.1R2;\n  *  23.2 versions earlier than 23.2R1-S2, 23.2R2.\n\n\n\n\nJuniper Networks Junos OS Evolved\n\n\n\n  *  All versions earlier than 21.3R3-S5-EVO;\n  *  21.4-EVO versions earlier than 21.4R3-S5-EVO;\n  *  22.1-EVO versions earlier than 22.1R3-S4-EVO;\n  *  22.2-EVO versions earlier than 22.2R3-S2-EVO;\n  *  22.3-EVO versions later than 22.3R1-EVO;\n  *  22.4-EVO versions earlier than 22.4R2-S2-EVO, 22.4R3-EVO;\n  *  23.1-EVO versions earlier than 23.1R2-EVO;\n  *  23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00543,"percentile":0.45924,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-122","CWE-787"],"published":"2024-01-12T00:52:52Z","modified":"2026-06-17T07:09:47Z","products":[{"vendor":"juniper","product":"junos"},{"vendor":"juniper","product":"junos_os_evolved"},{"vendor":"juniper networks","product":"junos os"},{"vendor":"juniper networks","product":"junos os evolved"}],"references":[{"url":"https://supportportal.juniper.net/JSA75735","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:L/SC:N/SI:N/SA:N","tags":["technical-description","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-21596"},{"url":"https://github.com/advisories/GHSA-rj2r-9q5p-4c4w"}],"sources":{"cve":[{"id":"CVE-2024-21596","title":"Junos OS and Junos OS Evolved: A specific BGP UPDATE message will cause a crash in the backup Routing Engine in NSR-enabled devices","description":"\nA Heap-based Buffer Overflow vulnerability in the Routing Protocol Daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network based attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends a specific BGP UPDATE message to the device, this will cause a memory overwrite and therefore an RPD crash and restart in the backup Routing Engine (RE). Continued receipt of these packets will cause a sustained Denial of Service (DoS) condition in the backup RE.\n\nThe primary RE is not impacted by this issue and there is no impact on traffic.\n\nThis issue only affects devices with NSR enabled.\n\nNote: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability.\nThis issue requires an attacker to have an established BGP session to a system affected by the issue. This issue affects both eBGP and iBGP implementations.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n  *  All versions earlier than 20.4R3-S9;\n  *  21.2 versions earlier than 21.2R3-S7;\n  *  21.3 versions earlier than 21.3R3-S5;\n  *  21.4 versions earlier than 21.4R3-S5;\n  *  22.1 versions earlier than 22.1R3-S4;\n  *  22.2 versions earlier than 22.2R3-S2;\n  *  22.3 versions earlier than 22.3R3-S1;\n  *  22.4 versions earlier than 22.4R2-S2, 22.4R3;\n  *  23.1 versions earlier than 23.1R2;\n  *  23.2 versions earlier than 23.2R1-S2, 23.2R2.\n\n\n\n\nJuniper Networks Junos OS Evolved\n\n\n\n  *  All versions earlier than 21.3R3-S5-EVO;\n  *  21.4-EVO versions earlier than 21.4R3-S5-EVO;\n  *  22.1-EVO versions earlier than 22.1R3-S4-EVO;\n  *  22.2-EVO versions earlier than 22.2R3-S2-EVO;\n  *  22.3-EVO versions later than 22.3R1-EVO;\n  *  22.4-EVO versions earlier than 22.4R2-S2-EVO, 22.4R3-EVO;\n  *  23.1-EVO versions earlier than 23.1R2-EVO;\n  *  23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO.\n\n\n\n\n\n\n","status":"published","published":"2024-01-12T00:52:52.522Z","modified":"2024-09-25T19:17:45.753Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:34:04.681315Z"}],"euvd":[{"id":"EUVD-2024-19244","description":"\nA Heap-based Buffer Overflow vulnerability in the Routing Protocol Daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network based attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends a specific BGP UPDATE message to the device, this will cause a memory overwrite and therefore an RPD crash and restart in the backup Routing Engine (RE). Continued receipt of these packets will cause a sustained Denial of Service (DoS) condition in the backup RE.\n\nThe primary RE is not impacted by this issue and there is no impact on traffic.\n\nThis issue only affects devices with NSR enabled.\n\nNote: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability.\nThis issue requires an attacker to have an established BGP session to a system affected by the issue. This issue affects both eBGP and iBGP implementations.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n  *  All versions earlier than 20.4R3-S9;\n  *  21.2 versions earlier than 21.2R3-S7;\n  *  21.3 versions earlier than 21.3R3-S5;\n  *  21.4 versions earlier than 21.4R3-S5;\n  *  22.1 versions earlier than 22.1R3-S4;\n  *  22.2 versions earlier than 22.2R3-S2;\n  *  22.3 versions earlier than 22.3R3-S1;\n  *  22.4 versions earlier than 22.4R2-S2, 22.4R3;\n  *  23.1 versions earlier than 23.1R2;\n  *  23.2 versions earlier than 23.2R1-S2, 23.2R2.\n\n\n\n\nJuniper Networks Junos OS Evolved\n\n\n\n  *  All versions earlier than 21.3R3-S5-EVO;\n  *  21.4-EVO versions earlier than 21.4R3-S5-EVO;\n  *  22.1-EVO versions earlier than 22.1R3-S4-EVO;\n  *  22.2-EVO versions earlier than 22.2R3-S2-EVO;\n  *  22.3-EVO versions later than 22.3R1-EVO;\n  *  22.4-EVO versions earlier than 22.4R2-S2-EVO, 22.4R3-EVO;\n  *  23.1-EVO versions earlier than 23.1R2-EVO;\n  *  23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO.\n\n\n\n\n\n\n","status":"published","published":"2024-01-12T00:52:52Z","modified":"2024-09-25T19:17:45Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-03T00:28:12.011224Z"}],"ghsa":[{"id":"GHSA-rj2r-9q5p-4c4w","title":"\nA Heap-based Buffer Overflow vulnerability in the Routing Protocol Daemon (RPD) of Juniper...","description":"\nA Heap-based Buffer Overflow vulnerability in the Routing Protocol Daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network based attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends a specific BGP UPDATE message to the device, this will cause a memory overwrite and therefore an RPD crash and restart in the backup Routing Engine (RE). Continued receipt of these packets will cause a sustained Denial of Service (DoS) condition in the backup RE.\n\nThe primary RE is not impacted by this issue and there is no impact on traffic.\n\nThis issue only affects devices with NSR enabled.\n\nThis issue requires an attacker to have an established BGP session to a system affected by the issue. This issue affects both eBGP and iBGP implementations.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n  *  All versions earlier than 20.4R3-S9;\n  *  21.2 versions earlier than 21.2R3-S7;\n  *  21.3 versions earlier than 21.3R3-S5;\n  *  21.4 versions earlier than 21.4R3-S5;\n  *  22.1 versions earlier than 22.1R3-S4;\n  *  22.2 versions earlier than 22.2R3-S2;\n  *  22.3 versions earlier than 22.3R3-S1;\n  *  22.4 versions earlier than 22.4R2-S2, 22.4R3;\n  *  23.1 versions earlier than 23.1R2;\n  *  23.2 versions earlier than 23.2R1-S2, 23.2R2.\n\n\n\n\nJuniper Networks Junos OS Evolved\n\n\n\n  *  All versions earlier than 21.3R3-S5-EVO;\n  *  21.4-EVO versions earlier than 21.4R3-S5-EVO;\n  *  22.1-EVO versions earlier than 22.1R3-S4-EVO;\n  *  22.2-EVO versions earlier than 22.2R3-S2-EVO;\n  *  22.3-EVO versions later than 22.3R1-EVO;\n  *  22.4-EVO versions earlier than 22.4R2-S2-EVO, 22.4R3-EVO;\n  *  23.1-EVO versions earlier than 23.1R2-EVO;\n  *  23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO.\n\n\n\n\n\n\n","status":"published","published":"2024-01-12T03:30:48Z","modified":"2024-01-26T03:30:19Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-122","CWE-787"],"updated_at":"2026-11-02T14:55:29.01801Z"}],"nvd":[{"id":"CVE-2024-21596","description":"\nA Heap-based Buffer Overflow vulnerability in the Routing Protocol Daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network based attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends a specific BGP UPDATE message to the device, this will cause a memory overwrite and therefore an RPD crash and restart in the backup Routing Engine (RE). Continued receipt of these packets will cause a sustained Denial of Service (DoS) condition in the backup RE.\n\nThe primary RE is not impacted by this issue and there is no impact on traffic.\n\nThis issue only affects devices with NSR enabled.\n\nNote: NSR is not supported on the SRX Series and is therefore not affected by this vulnerability.\nThis issue requires an attacker to have an established BGP session to a system affected by the issue. This issue affects both eBGP and iBGP implementations.\n\nThis issue affects:\n\nJuniper Networks Junos OS\n\n\n\n  *  All versions earlier than 20.4R3-S9;\n  *  21.2 versions earlier than 21.2R3-S7;\n  *  21.3 versions earlier than 21.3R3-S5;\n  *  21.4 versions earlier than 21.4R3-S5;\n  *  22.1 versions earlier than 22.1R3-S4;\n  *  22.2 versions earlier than 22.2R3-S2;\n  *  22.3 versions earlier than 22.3R3-S1;\n  *  22.4 versions earlier than 22.4R2-S2, 22.4R3;\n  *  23.1 versions earlier than 23.1R2;\n  *  23.2 versions earlier than 23.2R1-S2, 23.2R2.\n\n\n\n\nJuniper Networks Junos OS Evolved\n\n\n\n  *  All versions earlier than 21.3R3-S5-EVO;\n  *  21.4-EVO versions earlier than 21.4R3-S5-EVO;\n  *  22.1-EVO versions earlier than 22.1R3-S4-EVO;\n  *  22.2-EVO versions earlier than 22.2R3-S2-EVO;\n  *  22.3-EVO versions later than 22.3R1-EVO;\n  *  22.4-EVO versions earlier than 22.4R2-S2-EVO, 22.4R3-EVO;\n  *  23.1-EVO versions earlier than 23.1R2-EVO;\n  *  23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO.\n\n\n\n\n\n\n","status":"published","published":"2024-01-12T01:15:47.267Z","modified":"2026-06-17T07:09:47.457Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","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:N/A:L","level":"medium","assessor":"primary"}],"cwes":["CWE-122","CWE-787"],"updated_at":"2026-11-02T14:09:30.070039Z"}]}}