CVE-2026-102055 Juniper Networks Junos OS - Buffer Overflow

Juniper Networks Junos OS on MX Series and Junos OS Evolved on PTX Series platforms contain a stack-based buffer overflow caused by processing a specific CFM message in the cfmd process, letting unauthenticated adjacent-network attackers execute arbitrary code as root or cause denial of service, exploit requires enhanced CFM mode enabled and a configured down-MEP.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution, Denial Of Service
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-121

Vendor fix

Update to the latest Junos OS version with the fix applied.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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