How severe is CVE-2025-27020?

CVE-2025-27020 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-27020 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-27020?

CVE-2025-27020 affects Nokia Infinera Mtc-9 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-27020?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-27020 have an EU (EUVD) identifier?

Yes. CVE-2025-27020 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201700.

When was CVE-2025-27020 published?

CVE-2025-27020 was published on 2025-12-08 and last updated on 2026-09-30.

CVE-2025-27020

CVE-2025-27020 is a critical-severity vulnerability in Nokia Infinera Mtc-9 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201700
Weakness: CWE-306
Affected product: Nokia Infinera Mtc-9 Firmware
Published: 2025-12-08
Last modified: 2026-09-30

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-27020?: CVE-2025-27020 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-27020 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-27020?: CVE-2025-27020 affects Nokia Infinera Mtc-9 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-27020?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-27020 have an EU (EUVD) identifier?: Yes. CVE-2025-27020 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201700.
When was CVE-2025-27020 published?: CVE-2025-27020 was published on 2025-12-08 and last updated on 2026-09-30.

References

https://www.cvcn.gov.it/cvcn/cve/CVE-2025-27020

Affected products (1)

cpe:2.3:o:nokia:infinera_mtc-9_firmware:*:*:*:*:*:*:*:*

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