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    CVE-2021-36226

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

    Published:Feb 6, 2023
    Last Modified:Mar 26, 2025
    EPS:Feb 6, 2023
    EPSS Score:0.00041
    CVSS Score:9.8

    Affected Products

    Vendor
    Westerndigital
    Product
    My Cloud Os
    Vendor
    Westerndigital
    Product
    My Cloud Pr4100

    Exploits

    https://github.com/pedrib/PoC/blob/master/advisories/Pwn2Own/Tokyo_2020/weekend_destroyer/weekend_destroyer.mdhttps://krebsonsecurity.com/2021/07/another-0-day-looms-for-many-western-digital-users/https://www.youtube.com/watch?v=vsg9YgvGBechttps://github.com/pedrib/PoC/blob/master/advisories/Pwn2Own/Tokyo_2020/weekend_destroyer/weekend_destroyer.mdhttps://krebsonsecurity.com/2021/07/another-0-day-looms-for-many-western-digital-users/https://www.youtube.com/watch?v=vsg9YgvGBec

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation

    Related CVEs

    CVE-2023-22814 (CVSS 10) — An authentication bypass issue via spoofing was discovered in the token-based authentication mechanism that co…
    CVE-2023-22815 (CVSS 6.2) — Post-authentication remote command injection vulnerability in Western Digital My Cloud OS 5 devices that could…
    CVE-2023-22816 (CVSS 6) — A post-authentication remote command injection vulnerability in a CGI file in Western Digital My Cloud OS 5 de…
    CVE-2022-29840 (CVSS 5.1) — Server-Side Request Forgery (SSRF) vulnerability that could allow a rogue server on the local network to modif…
    CVE-2022-29841 (CVSS 8) — Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability that …
    CVE-2022-29842 (CVSS 9.8) — Improper Neutralization of Special Elements used in a Command ('Command Injection') vulnerability that could a…
    CVE-2021-36225 (CVSS 8.8) — Western Digital My Cloud devices before OS5 allow REST API access by low-privileged accounts, as demonstrated …
    CVE-2021-36224 (CVSS 9.8) — Western Digital My Cloud devices before OS5 have a nobody account with a blank password.…
    CVE-2022-29838 (CVSS 4.3) — Improper Authentication vulnerability in the encrypted volumes and auto mount features of Western Digital My C…
    CVE-2022-29839 (CVSS 4.1) — Insufficiently Protected Credentials vulnerability in the remote backups application on Western Digital My Clo…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High