What is CVE-2025-27020?

CVE-2025-27020 is a critical-severity vulnerability in Infinera Mtc-9, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2025-12-08.

How severe is CVE-2025-27020?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Infinera Mtc-9

CVE-2025-27020

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.

Vulnerability class: Broken Authentication

EPSS: 0.005 (37.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 (Third Party Advisory, government-resource)

Frequently asked questions

What is CVE-2025-27020?: CVE-2025-27020 is a critical-severity vulnerability in Infinera Mtc-9, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2025-12-08.
How severe is CVE-2025-27020?: Critical severity. CVSS v3 base score is 9.8 out of 10.