CVE-2025-27021: The misconfiguration in the sudoers configuration of the operating system in Infinera G42 version R6.1.3 allo

Q: How do I fix CVE-2025-27021?

g42 firmware: upgrade to 7.1. Exact commands for each OS are on this page.

Q: Is CVE-2025-27021 being exploited?

CVE-2025-27021 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-2025-27021 affect?

CVE-2025-27021 affects g42 firmware. Severity is high (CVSS 7.0). The misconfiguration in the sudoers configuration of the operating system in Infinera G42 version R6.1.3 allows low privileged OS users to read/write physical memory via devmem command line tool. This could allow sensitive information d

Routine

HIGH 7.0UPGRADE

CVE-2025-27021 is a high-severity flaw (CVSS 7.0) affecting g42 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The misconfiguration in the sudoers configuration of the operating system in Infinera G42 version R6.1.3 allows low privileged OS users to read/write physical memory via devmem command line tool. This could allow sensitive information disclosure, denial of service, and privilege escalation by tampering with kernel memory. Details: The output of "sudo -l" reports the presence of "devmem" command executable as super user without using a pas

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.0 (High)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-266
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 09:15 UTCPublished CVE record published
2026-06-17 09:02 UTCUpdated Record last modified

nokia g42 firmware UPGRADE

Affected: >= 6.1.3 and < 7.1

Fixed in: 7.1

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-2025-27021?

g42 firmware: upgrade to 7.1. Exact commands for each OS are on this page.

Is CVE-2025-27021 being exploited?

CVE-2025-27021 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-2025-27021 affect?

CVE-2025-27021 affects g42 firmware. Severity is high (CVSS 7.0). The misconfiguration in the sudoers configuration of the operating system in Infinera G42 version R6.1.3 allows low privileged OS users to read/write physical memory via devmem command line tool. This could allow sensitive information d

How urgent is CVE-2025-27021?

Priority 26/100. High severity

Software pages

Sudo vulnerabilities · Nokia vulnerabilities

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References

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