{"id":"CVE-2024-39526","url":"https://www.cyber-defence.io/tools/cve/CVE-2024-39526","generatedAt":"2026-10-28T03:42:21.040Z","title":"An Improper Handling of Exceptional Conditions vulnerability in packet processing of Juniper Networks Junos OS on MX Series with MPC10/MPC11/LC9600 line cards, EX9200 with EX9200-15C lines cards, MX304 devices, and Juniper Networks Junos OS Evolved on…","description":"An Improper Handling of Exceptional Conditions vulnerability in packet processing of Juniper Networks Junos OS on MX Series with MPC10/MPC11/LC9600 line cards, EX9200 with EX9200-15C lines cards, MX304 devices, and Juniper Networks Junos OS Evolved on PTX Series, allows an attacker sending malformed DHCP packets to cause ingress packet processing to stop, leading to a Denial of Service (DoS).  Continued receipt and processing of these packets will create a sustained Denial of Service (DoS) condition.\n\nThis issue only occurs if DHCP snooping is enabled. See configuration below.\n\nThis issue can be detected using following commands. Their output will display the interface status going down:\n\n\nuser@device>show interfaces <if--x/x/x>\nuser@device>show log messages | match <if--x/x/x>\nuser@device>show log messages ==> will display the \"[Error] Wedge-Detect : Host Loopback Wedge Detected: PFE: no,\" logs.\n\nThis issue affects:\nJunos OS on \n\nMX Series \n\nwith MPC10/MPC11/LC9600 line cards, EX9200 with EX9200-15C line cards, and MX304: \n\n\n  *  All versions before 21.2R3-S7, \n  *  from 21.4 before 21.4R3-S6, \n  *  from 22.2 before 22.2R3-S3, \n  *  all versions of 22.3,\n  *  from 22.4 before 22.4R3, \n  *  from 23.2 before 23.2R2; \n\n\n\nJunos OS Evolved on PTX Series: \n  *  from 19.3R1-EVO before 21.2R3-S8-EVO,\n\n  *  from 21.4-EVO before 21.4R3-S7-EVO, \n  *  from 22.1-EVO before 22.1R3-S6-EVO, \n  *  from 22.2-EVO before 22.2R3-S5-EVO, \n  *  from 22.3-EVO before 22.3R3-S3-EVO, \n  *  from 22.4-EVO before 22.4R3-S1-EVO, \n  *  from 23.2-EVO before 23.2R2-S2-EVO, \n  *  from 23.4-EVO before 23.4R2-EVO.\n\n\n\nJunos OS Evolved releases prior to 19.3R1-EVO are unaffected by this vulnerability","published":"2024-10-11T16:15:06.000Z","lastModified":"2026-06-17T07:42:08.000Z","status":"Analyzed","sourceIdentifier":"sirt@juniper.net","cvss":{"version":"4.0","score":7.1,"severity":"HIGH","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/M"},"cwe":["CWE-755"],"affected":["juniper/junos os evolved","juniper/junos"],"epss":{"score":0.00367,"percentile":0.30419,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://supportportal.juniper.net/JSA88103","tags":["Vendor Advisory"],"source":"sirt@juniper.net"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-39526","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}