{"id":"CVE-2024-39517","aliases":["EUVD-2024-38043","GHSA-fc5c-g544-fmfp"],"status":"published","title":"Junos OS and Junos OS Evolved: Upon processing specific L2 traffic, rpd can hang in devices with EVPN/VXLAN configured","description":"An Improper Check for Unusual or Exceptional Conditions vulnerability in the Layer 2 Address Learning Daemon (l2ald) on Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause Denial of Service (DoS).\n\nIn an EVPN/VXLAN scenario, when a high amount specific Layer 2 packets are processed by the device, it can cause the Routing Protocol Daemon (rpd) to utilize all CPU resources which causes the device to hang. A manual restart of the rpd is required to restore services.\n\nThis issue affects both IPv4 and IPv6 implementations.\nThis issue affects\nJunos OS:\nAll versions earlier than 21.4R3-S7;\n22.1 versions earlier than 22.1R3-S5;\n22.2 versions earlier than 22.2R3-S3;\n22.3 versions earlier than 22.3R3-S3;\n22.4 versions earlier than 22.4R3-S2;\n23.2 versions earlier than 23.2R2;\n23.4 versions earlier than 23.4R1-S1.\n\nJunos OS Evolved:\nAll versions earlier than 21.4R3-S7-EVO;\n22.1-EVO versions earlier than 22.1R3-S5-EVO;\n22.2-EVO versions earlier than 22.2R3-S3-EVO;\n22.3-EVO versions earlier than 22.3R3-S3-EVO;\n22.4-EVO versions earlier than 22.4R3-S2-EVO;\n23.2-EVO versions earlier than 23.2R2-EVO;\n23.4-EVO versions earlier than 23.4R1-S1-EVO, 23.4R2-EVO.","severity":{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00246,"percentile":0.15998,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-754"],"published":"2024-07-10T23:06:40Z","modified":"2026-06-17T07:42:05Z","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/JSA79175","tags":["vendor-advisory","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-39517"},{"url":"https://github.com/advisories/GHSA-fc5c-g544-fmfp"}],"sources":{"cve":[{"id":"CVE-2024-39517","title":"Junos OS and Junos OS Evolved: Upon processing specific L2 traffic, rpd can hang in devices with EVPN/VXLAN configured","description":"An Improper Check for Unusual or Exceptional Conditions vulnerability in the Layer 2 Address Learning Daemon (l2ald) on Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause Denial of Service (DoS).\n\nIn an EVPN/VXLAN scenario, when a high amount specific Layer 2 packets are processed by the device, it can cause the Routing Protocol Daemon (rpd) to utilize all CPU resources which causes the device to hang. A manual restart of the rpd is required to restore services.\n\nThis issue affects both IPv4 and IPv6 implementations.\nThis issue affects\nJunos OS:\nAll versions earlier than 21.4R3-S7;\n22.1 versions earlier than 22.1R3-S5;\n22.2 versions earlier than 22.2R3-S3;\n22.3 versions earlier than 22.3R3-S3;\n22.4 versions earlier than 22.4R3-S2;\n23.2 versions earlier than 23.2R2;\n23.4 versions earlier than 23.4R1-S1.\n\nJunos OS Evolved:\nAll versions earlier than 21.4R3-S7-EVO;\n22.1-EVO versions earlier than 22.1R3-S5-EVO;\n22.2-EVO versions earlier than 22.2R3-S3-EVO;\n22.3-EVO versions earlier than 22.3R3-S3-EVO;\n22.4-EVO versions earlier than 22.4R3-S2-EVO;\n23.2-EVO versions earlier than 23.2R2-EVO;\n23.4-EVO versions earlier than 23.4R1-S1-EVO, 23.4R2-EVO.","status":"published","published":"2024-07-10T23:06:40.329Z","modified":"2024-08-02T04:26:15.885Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L","level":"high","assessor":"cna"},{"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-754"],"updated_at":"2026-11-02T14:34:19.28149Z"}],"euvd":[{"id":"EUVD-2024-38043","description":"An Improper Check for Unusual or Exceptional Conditions vulnerability in the Layer 2 Address Learning Daemon (l2ald) on Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause Denial of Service (DoS).\n\nIn an EVPN/VXLAN scenario, when a high amount specific Layer 2 packets are processed by the device, it can cause the Routing Protocol Daemon (rpd) to utilize all CPU resources which causes the device to hang. A manual restart of the rpd is required to restore services.\n\nThis issue affects both IPv4 and IPv6 implementations.\nThis issue affects\nJunos OS:\nAll versions earlier than 21.4R3-S7;\n22.1 versions earlier than 22.1R3-S5;\n22.2 versions earlier than 22.2R3-S3;\n22.3 versions earlier than 22.3R3-S3;\n22.4 versions earlier than 22.4R3-S2;\n23.2 versions earlier than 23.2R2;\n23.4 versions earlier than 23.4R1-S1.\n\nJunos OS Evolved:\nAll versions earlier than 21.4R3-S7-EVO;\n22.1-EVO versions earlier than 22.1R3-S5-EVO;\n22.2-EVO versions earlier than 22.2R3-S3-EVO;\n22.3-EVO versions earlier than 22.3R3-S3-EVO;\n22.4-EVO versions earlier than 22.4R3-S2-EVO;\n23.2-EVO versions earlier than 23.2R2-EVO;\n23.4-EVO versions earlier than 23.4R1-S1-EVO, 23.4R2-EVO.","status":"published","published":"2024-07-10T23:06:40Z","modified":"2024-08-02T04:26:15Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L","level":"high"}],"updated_at":"2026-11-03T03:50:18.019857Z"}],"ghsa":[{"id":"GHSA-fc5c-g544-fmfp","title":"An Improper Check for Unusual or Exceptional Conditions vulnerability in the Layer 2 Address...","description":"An Improper Check for Unusual or Exceptional Conditions vulnerability in the Layer 2 Address Learning Daemon (l2ald) on Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause Denial of Service (DoS).\n\nIn an EVPN/VXLAN scenario, when a high amount specific Layer 2 packets are processed by the device, it can cause the Routing Protocol Daemon (rpd) to utilize all CPU resources which causes the device to hang. A manual restart of the rpd is required to restore services.\n\nThis issue affects both IPv4 and IPv6 implementations.\nThis issue affects\nJunos OS:\nAll versions earlier than 21.4R3-S7;\n22.1 versions earlier than 22.1R3-S5;\n22.2 versions earlier than 22.2R3-S3;\n22.3 versions earlier than 22.3R3-S3;\n22.4 versions earlier than 22.4R3-S2;\n23.2 versions earlier than 23.2R2;\n23.4 versions earlier than 23.4R1-S1.\n\nJunos OS Evolved:\nAll versions earlier than 21.4R3-S7-EVO;\n22.1-EVO versions earlier than 22.1R3-S5-EVO;\n22.2-EVO versions earlier than 22.2R3-S3-EVO;\n22.3-EVO versions earlier than 22.3R3-S3-EVO;\n22.4-EVO versions earlier than 22.4R3-S2-EVO;\n23.2-EVO versions earlier than 23.2R2-EVO;\n23.4-EVO versions earlier than 23.4R1-S1-EVO, 23.4R2-EVO.","status":"published","published":"2024-07-11T00:32:50Z","modified":"2024-08-09T05:01:52Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"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-754"],"updated_at":"2026-11-02T14:57:54.57979Z"}],"nvd":[{"id":"CVE-2024-39517","description":"An Improper Check for Unusual or Exceptional Conditions vulnerability in the Layer 2 Address Learning Daemon (l2ald) on Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause Denial of Service (DoS).\n\nIn an EVPN/VXLAN scenario, when a high amount specific Layer 2 packets are processed by the device, it can cause the Routing Protocol Daemon (rpd) to utilize all CPU resources which causes the device to hang. A manual restart of the rpd is required to restore services.\n\nThis issue affects both IPv4 and IPv6 implementations.\nThis issue affects\nJunos OS:\nAll versions earlier than 21.4R3-S7;\n22.1 versions earlier than 22.1R3-S5;\n22.2 versions earlier than 22.2R3-S3;\n22.3 versions earlier than 22.3R3-S3;\n22.4 versions earlier than 22.4R3-S2;\n23.2 versions earlier than 23.2R2;\n23.4 versions earlier than 23.4R1-S1.\n\nJunos OS Evolved:\nAll versions earlier than 21.4R3-S7-EVO;\n22.1-EVO versions earlier than 22.1R3-S5-EVO;\n22.2-EVO versions earlier than 22.2R3-S3-EVO;\n22.3-EVO versions earlier than 22.3R3-S3-EVO;\n22.4-EVO versions earlier than 22.4R3-S2-EVO;\n23.2-EVO versions earlier than 23.2R2-EVO;\n23.4-EVO versions earlier than 23.4R1-S1-EVO, 23.4R2-EVO.","status":"published","published":"2024-07-10T23:15:11.127Z","modified":"2026-06-17T07:42:05.967Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","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":"secondary"}],"cwes":["CWE-754"],"updated_at":"2026-11-02T14:10:12.016585Z"}]}}