Vulnerability report

Trusted Third Party Report High Confidence Not in CISA KEV

CVE-2021-35941

WD My Book Live

Western Digital / WD My Book Live

Watch CVE-2021-35941 Browse KEV feed
Severity
CVSS 7.5 · High
Confidence
High
Exploit status
Trusted Third Party Report
EPSS
12.7%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2021-35941 is an unauthenticated vulnerability affecting Western Digital WD My Book Live, WD My Book Live Duo.

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Also reported by third-party sources. Confidence is high.

Who is affected?

Western Digital / WD My Book Live and WD My Book Live Duo.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

WD My Book Live

Western Digital WD My Book Live (2.x and later) and WD My Book Live Duo (all versions) have an administrator API that can perform a system factory restore without authentication, as exploited in the wild in June 2021, a different vulnerability than CVE-2018-18472.

Published
29 Jun 2021
Exploitation Attempts Reported
29 Oct 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

CVE References

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation Attempts Observed in the Wild

GitHub Advisory Database

Recorded 29 Oct 2026

A trusted third party reported exploitation attempts.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
GitHub Advisory Database First 2026-10-29 10:59 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.5 High

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

12.7%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Missing Authentication for Critical Function CWE-306

All CVSS Scores

CVSS v3.1 7.5 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2.0 5.0 Medium

AV:N/AC:L/Au:N/C:N/I:N/A:P

Timeline

From disclosure to observed exploitation attempts

  1. 10:59 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party report of exploitation attempts

  2. 20:22 UTC

    CVE published

    Vulnerability disclosed publicly

  3. 00:00 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2021-35941

Sample API response 
{
  "cve_id": "CVE-2021-35941",
  "confidence": "High",
  "cvss_score": 7.5,
  "cvss_estimated": false,
  "epss_score": 0.1271,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}