CVE-2025-27026: A missing double-check feature in the WebGUI for CLI deactivation in Infinera G42 version R6.1.3 allows an au

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

g42 firmware: upgrade to 8.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-27026 being exploited?

CVE-2025-27026 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-27026 affect?

CVE-2025-27026 affects g42 firmware. Severity is medium (CVSS 4.9). 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

Q: How urgent is CVE-2025-27026?

Priority 25/100. No elevated risk signals yet.

Routine

MEDIUM 4.9UPGRADE

CVE-2025-27026 is a medium-severity flaw (CVSS 4.9) affecting g42 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 devi

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-1220
Published	2025-07-02
Last modified	2026-06-17

Publisher (CNA): ENISA · Vendor: nokia

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-07-02 14:15 UTCPublished CVE record published
2026-06-17 09:02 UTCUpdated Record last modified

nokia g42 firmware UPGRADE

Affected: >= 6.1.3 and < 8.0

Fixed in: 8.0

Safe to downgrade to: a release before 6.1.3

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-27026?

g42 firmware: upgrade to 8.0. Exact commands for each OS are on this page.

Is CVE-2025-27026 being exploited?

CVE-2025-27026 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-27026 affect?

CVE-2025-27026 affects g42 firmware. Severity is medium (CVSS 4.9). 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

How urgent is CVE-2025-27026?

Priority 25/100. No elevated risk signals yet.

Software pages

Nokia vulnerabilities

Related CVEs

CVE-2025-27024 MEDIUM 6.5 UPGRADE Unrestricted access to OS file system in SFTP service in Infinera G42 version R6.1.3 allows remote authentica
CVE-2025-27023 MEDIUM 6.5 UPGRADE Lack or insufficent input validation in WebGUI CLI web in Infinera G42 version R6.1.3 allows remote authentic
CVE-2025-27022 HIGH 7.5 UPGRADE A path traversal vulnerability of the WebGUI HTTP endpoint in Infinera G42 version R6.1.3 allows remote authe
CVE-2025-27021 HIGH 7.0 UPGRADE The misconfiguration in the sudoers configuration of the operating system in Infinera G42 version R6.1.3 allo

References

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