CVE-2025-27020: Nokia Infinera Mtc-9 Firmware

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Improper configuration of the SSH service in Infinera MTC-9 allows an unauthenticated attacker to execute arbitrary commands and access data on file system . This issue affects MTC-9: from R22.1.1.0275 before R23.0.

Affected products

• Nokia Infinera Mtc-9 Firmware: from 22.1.1.0275, before 23.0 (fixed in 23.0)

Published 2025-12-08. Last modified 2026-10-07.