{"id":"CVE-2026-102080","aliases":["EUVD-2026-101464","GHSA-gvgv-h84m-5m5q"],"status":"published","title":"Junos OS: MX Series: Malformed SyncE or PTP clock input causes continuous RE switchover","description":"An Improper Resource Locking vulnerability in the clock synchronization daemon (clksyncd) of Juniper Networks Junos OS on MX Series allows a unauthenticated, logically adjacent attacker to cause a Denial-of-Service (DoS).\n\n\n\nIf a SyncE or PTP upstream node sends a malformed message to an MX device equipped with SCBE3, a false 19.44MHz alarm is generated on the master RE. This leads to persistent RE switchovers and a clksyncd process crash. This issue is outside the attacker's direct control as it's a race condition.\n\nThis issue affects Junos OS on MX Series:\n\n\n  *  All versions before 23.2R2-S7.7;\n  *  23.4 versions before 23.4R2-S8.13;\n  *  24.2 versions before 24.2R2-S5.5;\n  *  24.4 versions before 24.4R2-S4;\n  *  25.2 versions before 25.2R2-S1;\n  *  25.4 versions before 25.4R1-S2.","severity":{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:U/RE:M","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00183,"percentile":0.07963,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-413"],"published":"2026-10-14T16:26:30Z","modified":"2026-10-15T16:24:19Z","products":[{"vendor":"juniper networks","product":"junos os"}],"references":[{"url":"https://supportportal.juniper.net/JSA112178","tags":["vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102080"},{"url":"https://github.com/advisories/GHSA-gvgv-h84m-5m5q"}],"sources":{"cve":[{"id":"CVE-2026-102080","title":"Junos OS: MX Series: Malformed SyncE or PTP clock input causes continuous RE switchover","description":"An Improper Resource Locking vulnerability in the clock synchronization daemon (clksyncd) of Juniper Networks Junos OS on MX Series allows a unauthenticated, logically adjacent attacker to cause a Denial-of-Service (DoS).\n\n\n\nIf a SyncE or PTP upstream node sends a malformed message to an MX device equipped with SCBE3, a false 19.44MHz alarm is generated on the master RE. This leads to persistent RE switchovers and a clksyncd process crash. This issue is outside the attacker's direct control as it's a race condition.\n\nThis issue affects Junos OS on MX Series:\n\n\n  *  All versions before 23.2R2-S7.7;\n  *  23.4 versions before 23.4R2-S8.13;\n  *  24.2 versions before 24.2R2-S5.5;\n  *  24.4 versions before 24.4R2-S4;\n  *  25.2 versions before 25.2R2-S1;\n  *  25.4 versions before 25.4R1-S2.","status":"published","published":"2026-10-14T16:26:30.073Z","modified":"2026-10-14T20:26:05.796Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:U/RE:M","level":"medium","assessor":"cna"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-413"],"updated_at":"2026-11-02T13:38:54.394896Z"}],"euvd":[{"id":"EUVD-2026-101464","description":"An Improper Resource Locking vulnerability in the clock synchronization daemon (clksyncd) of Juniper Networks Junos OS on MX Series allows a unauthenticated, logically adjacent attacker to cause a Denial-of-Service (DoS).\n\n\n\nIf a SyncE or PTP upstream node sends a malformed message to an MX device equipped with SCBE3, a false 19.44MHz alarm is generated on the master RE. This leads to persistent RE switchovers and a clksyncd process crash. This issue is outside the attacker's direct control as it's a race condition.\n\nThis issue affects Junos OS on MX Series:\n\n\n  *  All versions before 23.2R2-S7.7;\n  *  23.4 versions before 23.4R2-S8.13;\n  *  24.2 versions before 24.2R2-S5.5;\n  *  24.4 versions before 24.4R2-S4;\n  *  25.2 versions before 25.2R2-S1;\n  *  25.4 versions before 25.4R1-S2.","status":"published","published":"2026-10-14T16:26:30Z","modified":"2026-10-14T20:26:05Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:U/RE:M","level":"medium"}],"updated_at":"2026-11-02T17:27:12.294621Z"}],"ghsa":[{"id":"GHSA-gvgv-h84m-5m5q","title":"An Improper Resource Locking vulnerability in the clock synchronization daemon (clksyncd) of...","description":"An Improper Resource Locking vulnerability in the clock synchronization daemon (clksyncd) of Juniper Networks Junos OS on MX Series allows a unauthenticated, logically adjacent attacker to cause a Denial-of-Service (DoS).\n\n\n\nIf a SyncE or PTP upstream node sends a malformed message to an MX device equipped with SCBE3, a false 19.44MHz alarm is generated on the master RE. This leads to persistent RE switchovers and a clksyncd process crash. This issue is outside the attacker's direct control as it's a race condition.\n\nThis issue affects Junos OS on MX Series:\n\n\n  *  All versions before 23.2R2-S7.7;\n  *  23.4 versions before 23.4R2-S8.13;\n  *  24.2 versions before 24.2R2-S5.5;\n  *  24.4 versions before 24.4R2-S4;\n  *  25.2 versions before 25.2R2-S1;\n  *  25.4 versions before 25.4R1-S2.","status":"published","published":"2026-10-14T18:32:25Z","modified":"2026-10-14T18:32:33Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/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:Y/R:U/V:X/RE:M/U:X","level":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-413"],"updated_at":"2026-11-02T15:13:28.02433Z"}],"nvd":[{"id":"CVE-2026-102080","description":"An Improper Resource Locking vulnerability in the clock synchronization daemon (clksyncd) of Juniper Networks Junos OS on MX Series allows a unauthenticated, logically adjacent attacker to cause a Denial-of-Service (DoS).\n\n\n\nIf a SyncE or PTP upstream node sends a malformed message to an MX device equipped with SCBE3, a false 19.44MHz alarm is generated on the master RE. This leads to persistent RE switchovers and a clksyncd process crash. This issue is outside the attacker's direct control as it's a race condition.\n\nThis issue affects Junos OS on MX Series:\n\n\n  *  All versions before 23.2R2-S7.7;\n  *  23.4 versions before 23.4R2-S8.13;\n  *  24.2 versions before 24.2R2-S5.5;\n  *  24.4 versions before 24.4R2-S4;\n  *  25.2 versions before 25.2R2-S1;\n  *  25.4 versions before 25.4R1-S2.","status":"published","published":"2026-10-14T17:18:03.703Z","modified":"2026-10-15T16:24:19.073Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:A/AC:L/AT:P/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:Y/R:U/V:X/RE:M/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-413"],"updated_at":"2026-11-02T14:12:59.328869Z"}]}}