What’s Vulnerable › Vulnerabilities

CVE-2021-36226

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-02-06 · updated 2026-06-17
• Weakness: CWE-347

Description

Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade files.

Affected products

• Western Digital My Cloud: before 5.02.104 — fixed in 5.02.104

How to fix

Upgrade to a fixed version: Western Digital My Cloud 5.02.104. Check the vendor advisory for mitigations.

References

• https://github.com/pedrib/PoC/blob/master/advisories/Pwn2Own/Tokyo_2020/weekend_destroyer/weekend_destroyer.md
• https://krebsonsecurity.com/2021/07/another-0-day-looms-for-many-western-digital-users/
• https://www.youtube.com/watch?v=vsg9YgvGBec
• https://github.com/pedrib/PoC/blob/master/advisories/Pwn2Own/Tokyo_2020/weekend_destroyer/weekend_destroyer.md
• https://krebsonsecurity.com/2021/07/another-0-day-looms-for-many-western-digital-users/
• https://www.youtube.com/watch?v=vsg9YgvGBec

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