CVE-2021-46390: An access control issue in the authentication module of Lexar_F35 v1.0.34 allows attackers to access sensitive

Routine

MEDIUM 6.8MITIGATE

CVE-2021-46390 is a medium-severity flaw (CVSS 6.8) affecting f35 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An access control issue in the authentication module of Lexar_F35 v1.0.34 allows attackers to access sensitive data and cause a Denial of Service (DoS). An attacker without access to securely protected data on a secure USB flash drive can bypass user authentication without having any information related to the password of the registered user. The secure USB flash drive transmits the password entered by the user to the authentication module in the

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Physical
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-287
Published	2022-03-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lexar

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

Am I affected?

Timeline

2022-03-21 20:15 UTCPublished CVE record published
2026-06-17 04:14 UTCUpdated Record last modified

lexar f35 firmware MITIGATE

Affected: 1.0.34.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.34.0

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-2021-46390?

f35 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-46390 being exploited?

CVE-2021-46390 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-2021-46390 affect?

CVE-2021-46390 affects f35 firmware. Severity is medium (CVSS 6.8). An access control issue in the authentication module of Lexar_F35 v1.0.34 allows attackers to access sensitive data and cause a Denial of Service (DoS). An attacker without access to securely protected data on a secure USB flash drive can b

How urgent is CVE-2021-46390?

Priority 39/100. Public exploit reference

References

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