CVE-2021-36225
HIGH
8.8
CVSS Score
Published: February 6, 2023 at 12:00 AM UTC
Updated: June 17, 2026 at 03:58 AM UTC
2 products affected across 1 vendorMy Cloud OSMy Cloud PR4100
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Severity
HIGH8.8
Exploit prediction
EPSS 1%
SSVC
No known exploit
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 5.02.104
Affected range stops below 5.02.104, so it looks safe — our inference, not a vendor statement
westerndigital-my-cloud-pr4100 (same device)
80%
All versions
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (3)
ExploitPatchThird Party Advisory
Source: [email protected]
https://github.com/pedrib/PoC/blob/master/advisories/Pwn2Own/Tokyo_2020/weekend_destroyer/weekend_destroyer.mdExploitPatchThird Party Advisory
Source: [email protected]
https://krebsonsecurity.com/2021/07/another-0-day-looms-for-many-western-digital-users/ExploitPatchThird Party Advisory
Source: [email protected]
https://www.youtube.com/watch?v=vsg9YgvGBecSSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
8.8HIGHCISA-ADP
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-862
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