CVE-2021-36226
Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade...
Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade files.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade files.
- Record
CVE-2021-36226- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-347
- Updated
- 2026-11-02
CVE List
Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade files.
- Record
CVE-2021-36226- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-347
- Updated
- 2026-11-02
EUVDEUVD-2021-22846
Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade files.
- Record
EUVD-2021-22846- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-wmmr-frfj-gmmw
Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade...
Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade files.
- Record
GHSA-wmmr-frfj-gmmw- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-347
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-36226 is a critical vulnerability (CVSS 9.8) in Westerndigital My Cloud Os, published February 6, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.81%, the 57th percentile. No source names a fixed version.