CVE-2021-28653

Client impersonation via faulty Secure Enclave detection

Published Mar 18, 2021 · Updated Aug 3, 2024

Insecure key storage in Western Digital ArmorLock apps before 1.4.1 allows local users to extract client private keys from Keychain. A logic error treats Secure Enclave devices without biometric hardware as lacking the enclave, so keys are generated, stored, and used in the software-backed Keychain. Exploitation requires code execution as the device user on that hardware combination and exposes keys that permit client impersonation.

CVSS severity6.5
Medium
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insecure key storage in Western Digital ArmorLock apps before 1.4.1 allows local users to extract client private keys from Keychain. A logic error treats Secure Enclave devices without biometric hardware as lacking the enclave, so keys are generated, stored, and used in the software-backed Keychain. Exploitation requires code execution as the device user on that hardware combination and exposes keys that permit client impersonation.

The record

CVE
CVE-2021-28653
Published
Mar 18, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-922, T1555.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-922Insecure Storage of Sensitive Information
T1555.001Keychain

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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