{"schemaVersion":3,"id":"CVE-2026-102080","aliases":[],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-10-14T16:26:30.073Z","modified":"2026-10-14T20:26:05.796Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":6,"severity":"medium","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":6,"severity":"medium","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00183,"percentile":0.07429,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-15T00:00:00.000Z","score":0.00183,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00183,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00183,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00183,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00183,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00183,"percentile":0.07429}],"last30":[{"date":"2026-10-15T00:00:00.000Z","score":0.00183,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00183,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00183,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00183,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00183,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00183,"percentile":0.07429}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-413","name":"Improper Resource Locking","description":"The product does not lock or does not correctly lock a resource when the product must have exclusive access to the resource.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/413.html"}],"affected":[{"vendor":"juniper networks","product":"junos os","name":"Junos OS","label":"junos os","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 23.2R2-S7.7","noFixRecorded":false,"fixedIn":null},{"text":"≥ 23.4, < 23.4R2-S8.13","noFixRecorded":false,"fixedIn":null},{"text":"≥ 24.2, < 24.2R2-S5.5","noFixRecorded":false,"fixedIn":null},{"text":"≥ 24.4, < 24.4R2-S4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 25.2, < 25.2R2-S1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 25.4, < 25.4R1-S2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 23.2R2-S7.7 | ≥ 23.4, < 23.4R2-S8.13 | ≥ 24.2, < 24.2R2-S5.5 | ≥ 24.4, < 24.4R2-S4 | ≥ 25.2, < 25.2R2-S1 | ≥ 25.4, < 25.4R1-S2","eol":null,"hubHref":"/vendor/juniper_networks/junos_os"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://supportportal.juniper.net/JSA112178","label":"supportportal.juniper.net/JSA112178","hostname":"supportportal.juniper.net","tags":["Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-14T16:26:30.073Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-14T20:26:05.796Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":24,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T05:48:04.983Z","stale":false,"partial":false}}