{"cve":"CVE-2024-39530","nvd":{"published":"2024-07-11T16:15:04.613","modified":"2026-06-17T07:42:08.257","status":"Modified","description":"An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis management daemon (chassisd) of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause a \n\nDenial-of-Service (DoS).\n\nIf an attempt is made to access specific sensors on platforms not supporting these sensors, either via GRPC or netconf, chassisd will crash and restart leading to a restart of all FPCs and thereby a complete outage.\n\nThis issue affects Junos OS:\n\n\n\n  *  21.4 versions from 21.4R3 before 21.4R3-S5,\n  *  22.1 versions from 22.1R3 before 22.1R3-S4,\n  *  22.2 versions from 22.2R2 before 22.2R3,\n  *  22.3 versions from 22.3R1 before 22.3R2-S2, 22.3R3,\n  *  22.4 versions from 22.4R1 before 22.4R2.\n\n\nThis issue does not affect Junos OS versions earlier than 21.4.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-754"],"references":["https://supportportal.juniper.net/JSA82989","https://supportportal.juniper.net/JSA82989"],"products":["juniper:junos"],"source":"nvd","synced_at":"2026-10-19T21:52:42.518321223+00:00"},"epss":{"cve":"CVE-2024-39530","score":0.00476,"percentile":0.41144,"date":"2026-11-01"},"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."]}