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CVE-2025-27020

Nokia Infinera Mtc-9 Firmware authentication bypass

9.8 CRITICALEPSS 0.50%
  1. Published8 Dec 2025

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Nokia Infinera Mtc-9 Firmware≥ 22.1.1.0275 < 23.0

Remediation

Fixed in
Nokia Infinera Mtc-9 Firmware≥ 23.0

References

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Frequently asked

Is CVE-2025-27020 being actively exploited?

CVE-2025-27020 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.50%.

How severe is CVE-2025-27020?

CVE-2025-27020 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.50% probability of exploitation.

Which products are affected by CVE-2025-27020?

Affected products include Nokia Infinera Mtc-9 Firmware.

How do I fix CVE-2025-27020?

Upgrade affected software to a fixed version, for example Nokia Infinera Mtc-9 Firmware 23.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-27020 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.