8.8

CVE-2021-36225: westerndigital my_cloud_os Missing Authorization

CVSS: 8.8v3.1HighModified
Published 06-02-2023Last modified 26-03-2025
Open JSON

Vulnerability summary

CVE-2021-36225 is a high (CVSS 8.8) Missing Authorization vulnerability in westerndigital my_cloud_os. EPSS estimates a 1.05% chance of exploitation in the next 30 days, higher than 63.6% of scored vulnerabilities. 3 public exploits are recorded.

Overall risk
45/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
1.05%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits3github, reference

Timeline

  1. 06-02-2023
    PublishedVulnerability first disclosed.
  2. 26-03-2025
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

1.05%

Chance of exploitation in the next 30 days

Percentile

64%

Versus all other CVEs

30-day change

0.00 pp

From 1.05% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.05%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

3 found
  • githubUnverified

    Poc

    Maturity: poc

  • referenceUnverified

    Exploit Reference (krebsonsecurity.com)

    Maturity: unknown

  • referenceUnverified

    Exploit Reference (youtube.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Westerndigital1 product

1 vendor · 1 product

References

3 links