{"cve":"CVE-2024-39517","nvd":{"published":"2024-07-10T23:15:11.127","modified":"2026-06-17T07:42:05.967","status":"Analyzed","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.","cvss_v4":{"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","score":7.1},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-754"],"references":["https://supportportal.juniper.net/JSA79175","https://supportportal.juniper.net/JSA79175"],"products":["juniper:junos","juniper:junos_os_evolved"],"source":"nvd","synced_at":"2026-10-19T21:52:42.518321223+00:00"},"epss":{"cve":"CVE-2024-39517","score":0.00246,"percentile":0.15921,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}