What is the CVSS score of CVE-2025-27019?

CVE-2025-27019 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Infinera Mtc 9 Firmware are affected by CVE-2025-27019?

Organizations using Infinera MTC-9 face critical risk from CVE-2025-27019, a missing authentication vulnerability rated CVSS 9.8.

How to fix or mitigate CVE-2025-27019?

Within 24 hours: Identify all affected systems running Infinera MTC-9 and apply vendor patches immediately. Audit authentication configurations and rotate any potentially compromised credentials.

Infinera Mtc 9 Firmware CVE-2025-27019

EUVD-2025-201701 CRITICAL

Missing Authentication for Critical Function (CWE-306)

2025-12-08 a6d3dc9e-0591-4a13-bce7-0f5b31ff6158

Authentication Bypass Infinera Mtc 9 Firmware

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

EUVD ID Assigned

Mar 15, 2026 - 17:54 euvd

EUVD-2025-201701

Analysis Generated

Mar 15, 2026 - 17:54 vuln.today

CVE Published

Dec 08, 2025 - 10:16 nvd

CRITICAL 9.8

DescriptionCVE.org

Remote shell service (RSH) in Infinera MTC-9 version R22.1.1.0275 allows an attacker to utilize password-less user accounts and obtain system access by activating a reverse shell.This issue affects MTC-9: from R22.1.1.0275 before R23.0.

Analysis

Technical ContextAI

An authentication bypass vulnerability allows attackers to circumvent login mechanisms and gain unauthorized access without valid credentials. This vulnerability is classified as Missing Authentication for Critical Function (CWE-306).

RemediationAI

Implement robust authentication mechanisms. Use multi-factor authentication. Review authentication logic for bypass conditions. Remove default credentials.