Junos OS: MX Series: Malformed SyncE or PTP clock input causes continuous RE switchover
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). If 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. This issue affects Junos OS on MX Series: * All versions before 23.2R2-S7.7; * 23.4 versions before 23.4R2-S8.13; * 24.2 versions before 24.2R2-S5.5; * 24.4 versions before 24.4R2-S4; * 25.2 versions before 25.2R2-S1; * 25.4 versions before 25.4R1-S2.
CVE-2026-102080
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-102080
Junos OS
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Juniper Networks",
"product": "Junos OS",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "23.2R2-S7.7",
"versionType": "custom"
},
{
"status": "affected",
"version": "23.4",
"lessThan": "23.4R2-S8.13",
"versionType": "custom"
},
{
"status": "affected",
"version": "24.2",
"lessThan": "24.2R2-S5.5",
"versionType": "custom"
},
{
"status": "affected",
"version": "24.4",
"lessThan": "24.4R2-S4",
"versionType": "custom"
},
{
"status": "affected",
"version": "25.2",
"lessThan": "25.2R2-S1",
"versionType": "custom"
},
{
"status": "affected",
"version": "25.4",
"lessThan": "25.4R1-S2",
"versionType": "custom"
}
],
"platforms": [
"MX Series"
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-102080
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #23187 · Revision 1
- Added to Heist Feed
- Publisher date