CVE-2021-27448: A miscommunication in the file system allows adversaries with access to the MU320E to escalate privileges on t

Q: How do I fix CVE-2021-27448?

mu320e firmware: upgrade to 04a00.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-27448 being exploited?

CVE-2021-27448 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-2021-27448 affect?

CVE-2021-27448 affects mu320e firmware. Severity is high (CVSS 7.8). A miscommunication in the file system allows adversaries with access to the MU320E to escalate privileges on the MU320E (all firmware versions prior to v04A00.1).

Routine

HIGH 7.8UPGRADE

CVE-2021-27448 is a high-severity flaw (CVSS 7.8) affecting mu320e firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A miscommunication in the file system allows adversaries with access to the MU320E to escalate privileges on the MU320E (all firmware versions prior to v04A00.1).

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-250, CWE-269
Published	2021-03-25
Last modified	2026-06-17

Publisher (CNA): ICS-CERT · Vendor: ge

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

Am I affected?

Timeline

2021-03-25 20:15 UTCPublished CVE record published
2026-06-17 03:44 UTCUpdated Record last modified

ge mu320e firmware UPGRADE

Affected: < 04a00.1

Fixed in: 04a00.1

Safe to downgrade to: no unaffected older release

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-2021-27448?

mu320e firmware: upgrade to 04a00.1. Exact commands for each OS are on this page.

Is CVE-2021-27448 being exploited?

CVE-2021-27448 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-2021-27448 affect?

CVE-2021-27448 affects mu320e firmware. Severity is high (CVSS 7.8). A miscommunication in the file system allows adversaries with access to the MU320E to escalate privileges on the MU320E (all firmware versions prior to v04A00.1).

How urgent is CVE-2021-27448?

Priority 31/100. High severity

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References

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