9.8

CVE-2021-36226: westerndigital my_cloud_os

CVSS: 9.8v3.1CriticalModified
Published 06-02-2023Last modified 26-03-2025
Open JSON

Vulnerability summary

CVE-2021-36226 is a critical (CVSS 9.8) vulnerability in westerndigital my_cloud_os. EPSS estimates a 0.81% chance of exploitation in the next 30 days, higher than 56.1% of scored vulnerabilities. 3 public exploits are recorded.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.81%
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 do not use cryptographically signed Firmware upgrade files.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.81%

Chance of exploitation in the next 30 days

Percentile

56%

Versus all other CVEs

30-day change

0.00 pp

From 0.81% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.81%

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