CVE intelligence and bounded remediation

CVE-2020-27160 — Westerndigital My Cloud Firmware security vulnerability

Critical CVSS 9.8

Addressed remote code execution vulnerability in AvailableApps.php that allowed escalation of privileges in Western Digital My Cloud NAS devices prior to 5.04.114 (issue 3 of 3).

Severity
Critical
CVSS
9.8 (3.1)
Published
2020-10-27
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-22

Affected products

  • westerndigital / my_cloud_firmware

Matched remediation archetype

Path traversal, unsafe upload, and file handling

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Trace untrusted filenames, archive entries, URLs, and path segments into read, write, include, extraction, and upload operations.
  • Identify filesystem roots, mount permissions, symbolic-link behavior, archive handling, and whether uploaded content is web-accessible or executable.
  • Review canonicalization and containment checks across supported operating systems and storage backends.

Remediate safely

  • Generate server-side storage identifiers and resolve paths beneath a fixed root using filesystem-aware containment checks.
  • Reject absolute, parent-relative, alternate-separator, device, link, and archive entries that escape the intended root.
  • Store uploads outside executable or served paths, validate type and size, and use private atomic temporary files.

Authoritative sources

Complete CVE record and remediation plan

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