Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade files.
Priority MEDIUM 44CWE-347Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-347.
Summary
Western Digital My Cloud devices before OS5 do not use cryptographically signed Firmware upgrade files.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00808 57th percentileScored 2026-11-07
Public exploit Yes 3 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:westerndigital:my_cloud_os:*:*:*:*:*:*:*:* | before 5.02.104 | Vulnerable | Westerndigital |
| cpe:2.3:h:westerndigital:my_cloud_pr4100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Westerndigital |
- cpe:2.3:o:westerndigital:my_cloud_os:*:*:*:*:*:*:*:* Versions before 5.02.104 Vulnerable ·Westerndigital
- cpe:2.3:h:westerndigital:my_cloud_pr4100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Westerndigital
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-36226
- 2026-10-03 Alias added: GHSA-wmmr-frfj-gmmw
References
More Westerndigital My Cloud Os vulnerabilities
- TI-2022-12202 Command Injection Vulnerability in Western Digital My Cloud devices CVSS 3.1CRITICAL 9.8
- TI-2023-08981 Authentication Bypass issue in My Cloud OS 5 devices CVSS 3.1CRITICAL 10.0
- TI-2022-12201 OS Command Injection vulnerability in Western Digital My Cloud devices CVSS 3.1CRITICAL 9.8
- TI-2022-07169 Insufficient Verification of Data Authenticity Remote Code Execution Vulnerability on Western Digital My Cloud devices. CVSS 3.1CRITICAL 9.8
- TI-2022-07167 Command Injection Remote Code Execution vulnerability on Western Digital My Cloud devices. CVSS 3.1CRITICAL 9.8
- TI-2022-07164 Pre-authenticated stack overflow vulnerability on FTP Service CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-36226 · CVE Program
- CVE-2021-36226 · NVD
- FIRST EPSS
- GHSA-wmmr-frfj-gmmw · GitHub Advisory Database · CC BY 4.0
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