CVE-2025-27026

Q: How do I fix CVE-2025-27026?

Upgrade g42 firmware to 8.0 or later.

Q: Is CVE-2025-27026 being actively exploited?

Not that we know of. CVE-2025-27026 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.34% is the estimated probability that it will be exploited in the next 30 days. That is higher than 26% of all scored CVEs.

Q: How severe is CVE-2025-27026?

CVE-2025-27026 has a CVSS v3 base score of 4.9, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2025-27026 affect?

Published advisories record a fix for g42 firmware (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

4.9

CVSS v3

NVD

Description

A missing double-check feature in the WebGUI for CLI deactivation in Infinera G42 version R6.1.3 allows an authenticated administrator to make other management interfaces unavailable via local and network interfaces. The CLI deactivation via the WebGUI does not only stop CLI interface but deactivates also Linux Shell, WebGUI and Physical Serial Console access. No confirmation is asked at deactivation time. Loosing access to these services device administrators are at risk of completely loosing device control.

CWE-1220

How to fix

Remediation Available

g42 firmwareNVD

Affected:>= 6.1.3, < 8.0Fixed in:8.0CVE-2025-27026derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.34%probability of exploitation in 30 days

26thpercentile

Low risk: more likely to be exploited than 26% of all known CVEs.

References

Third-Party Advisory2

Related Vulnerabilities

Other CWE-1220 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-31201	Critical	9.8	15%	KEV	Fix
CVE-2026-33825	High	7.8	6.7%	KEV + Ransom	Fix
CVE-2024-42365	High	7.4	4.7%	-	Fix
CVE-2026-39363	High	7.5	3.3%	-	Fix
CVE-2023-43040	Medium	6.5	2.5%	-	Fix
CVE-2025-4404	Critical	9.1	2.0%	-	Fix

Common questions

How do I fix CVE-2025-27026?

Upgrade g42 firmware to 8.0 or later.

Is CVE-2025-27026 being actively exploited?

Not that we know of. CVE-2025-27026 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.34% is the estimated probability that it will be exploited in the next 30 days. That is higher than 26% of all scored CVEs.

How severe is CVE-2025-27026?

CVE-2025-27026 has a CVSS v3 base score of 4.9, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2025-27026 affect?

Published advisories record a fix for g42 firmware (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-11.