CVE-2021-36225: Western Digital My Cloud devices before OS5 allow REST API access by low-privileged accounts, as demonstrated

Q: How do I fix CVE-2021-36225?

my cloud os: upgrade to 5.02.104. Exact commands for each OS are on this page.

Q: Is CVE-2021-36225 being exploited?

CVE-2021-36225 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-2021-36225 affect?

CVE-2021-36225 affects my cloud os. Severity is high (CVSS 8.8). Western Digital My Cloud devices before OS5 allow REST API access by low-privileged accounts, as demonstrated by API commands for firmware uploads and installation.

Q: How urgent is CVE-2021-36225?

Priority 52/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2021-36225 is a high-severity flaw (CVSS 8.8) affecting my cloud os. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Western Digital My Cloud devices before OS5 allow REST API access by low-privileged accounts, as demonstrated by API commands for firmware uploads and installation.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-862
Published	2023-02-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: westerndigital

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

Am I affected?

Timeline

2023-02-06 14:15 UTCPublished CVE record published
2026-06-17 03:58 UTCUpdated Record last modified

westerndigital my cloud os UPGRADE

Affected: < 5.02.104

Fixed in: 5.02.104

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-2021-36225?

my cloud os: upgrade to 5.02.104. Exact commands for each OS are on this page.

Is CVE-2021-36225 being exploited?

CVE-2021-36225 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-2021-36225 affect?

CVE-2021-36225 affects my cloud os. Severity is high (CVSS 8.8). Western Digital My Cloud devices before OS5 allow REST API access by low-privileged accounts, as demonstrated by API commands for firmware uploads and installation.

How urgent is CVE-2021-36225?

Priority 52/100. High severity; Public exploit reference

Software pages

Western Digital vulnerabilities

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References

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