CVE-2026-102055: Junos OS and Junos OS Evolved: MX Series, PTX Series: An attacker causes remote code execution and denial of service when enhanced CFM is enabled

Vulnerability summary

CVE-2026-102055 is a high (CVSS 8.8) Stack-based Buffer Overflow vulnerability in juniper networks junos os. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 24.3% of scored vulnerabilities.

Timeline

1. 14-10-2026
   PublishedVulnerability first disclosed.
2. 16-10-2026
   Last modifiedVulnerability information updated.

Description

A Stack-based Buffer Overflow vulnerability in the cfmd process of Juniper Networks Junos OS on MX Series and Junos OS Evolved on PTX Series platforms allows an unauthenticated adjacent-network attacker to execute arbitrary code as root or cause denial of service via a specific CFM Message sent to a configured down-MEP with enhanced CFM mode enabled.

• CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).