What is the severity of ZDI-21-277?

The severity of ZDI-21-277 is considered to be critical due to its potential for remote exploitation without authentication.

How can I fix ZDI-21-277?

To fix ZDI-21-277, update the firmware of the Western Digital MyCloud PR4100 to the latest version provided by the vendor.

What systems are affected by ZDI-21-277?

ZDI-21-277 specifically affects the Western Digital MyCloud PR4100 installations.

Is authentication required to exploit ZDI-21-277?

No, authentication is not required to exploit the vulnerability identified as ZDI-21-277.

What kind of information can be disclosed due to ZDI-21-277?

ZDI-21-277 allows remote attackers to disclose sensitive information from affected installations.

Vulnerability/
ZDI-21-277

high

7.5

30/1/2025

ZDI-21-277: Western Digital MyCloud PR4100 Link Resolution Information Disclosure Vulnerability

This vulnerability allows remote attackers to disclose sensitive information on affected installations of Western Digital MyCloud PR4100. Authentication is not required to exploit this vulnerability. The specific flaw exists within the SMB and AFP services. By creating a symbolic link, an attacker can abuse the service to read arbitrary files. An attacker can leverage this vulnerability to disclose information in the context of the service account.

Affected Software	Affected Version	How to fix
Western Digital My Cloud PR4100

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Frequently Asked Questions

What is the severity of ZDI-21-277?
The severity of ZDI-21-277 is considered to be critical due to its potential for remote exploitation without authentication.
How can I fix ZDI-21-277?
To fix ZDI-21-277, update the firmware of the Western Digital MyCloud PR4100 to the latest version provided by the vendor.
What systems are affected by ZDI-21-277?
ZDI-21-277 specifically affects the Western Digital MyCloud PR4100 installations.
Is authentication required to exploit ZDI-21-277?
No, authentication is not required to exploit the vulnerability identified as ZDI-21-277.
What kind of information can be disclosed due to ZDI-21-277?
ZDI-21-277 allows remote attackers to disclose sensitive information from affected installations.

agent/references
agent/type
agent/softwarecombine
agent/severity
agent/title
agent/description
agent/event
agent/source
agent/tags
collector/zdi-advisory
source/ZDI
alias/ZDI-21-277
alias/ZDI-CAN-12455
alias/CVE-2021-3310
agent/software-canonical-lookup
agent/software-canonical-lookup-request
vendor/western digital
canonical/western digital my cloud pr4100

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Frequently Asked Questions

What is the severity of ZDI-21-277?
The severity of ZDI-21-277 is considered to be critical due to its potential for remote exploitation without authentication.
How can I fix ZDI-21-277?
To fix ZDI-21-277, update the firmware of the Western Digital MyCloud PR4100 to the latest version provided by the vendor.
What systems are affected by ZDI-21-277?
ZDI-21-277 specifically affects the Western Digital MyCloud PR4100 installations.
Is authentication required to exploit ZDI-21-277?
No, authentication is not required to exploit the vulnerability identified as ZDI-21-277.
What kind of information can be disclosed due to ZDI-21-277?
ZDI-21-277 allows remote attackers to disclose sensitive information from affected installations.