Vulnerability Monitor

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CVE-2019-9949

Western Digital My Cloud Cloud, Mirror Gen2, EX2 Ultra, EX2100, EX4100, DL2100, DL4100, PR2100 and PR4100 before firmware 2.31.183 are affected by a code execution (as root, starting from a low-privilege user session) vulnerability. The cgi-bin/webfile_mgr.cgi file allows arbitrary file write by abusing symlinks. Specifically, this occurs by uploading a tar archive that contains a symbolic link, then uploading another archive that writes a file to the link using the "cgi_untar" command. Other commands might also be susceptible. Code can be executed because the "name" parameter passed to the cgi_unzip command is not sanitized.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 8.8, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 18 products from westerndigital, from westerndigital, from westerndigital and 15 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2019, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2019-05-23T14:29:08.000

Last Modified

2026-06-17T02:44:55.013

Status

Modified

Source

[email protected]

Severity

CVSSv3.0: 8.8 (HIGH)

CVSSv2 Vector

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

Access Vector: NETWORK
Access Complexity: LOW
Authentication: SINGLE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

8.0

Impact Score

10.0

Weaknesses

Type: Primary
CWE-59

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	westerndigital	my_cloud_firmware	< 2.31.183	Yes
Hardware	westerndigital	my_cloud	-	No
Operating System	westerndigital	my_cloud_mirror_gen2_firmware	< 2.31.183	Yes
Hardware	westerndigital	my_cloud_mirror_gen2	-	No
Operating System	westerndigital	my_cloud_ex2_ultra_firmware	< 2.31.183	Yes
Hardware	westerndigital	my_cloud_ex2_ultra	-	No
Operating System	westerndigital	my_cloud_ex2100_firmware	< 2.31.183	Yes
Hardware	westerndigital	my_cloud_ex2100	-	No
Operating System	westerndigital	my_cloud_ex4100_firmware	< 2.31.183	Yes
Hardware	westerndigital	my_cloud_ex4100	-	No
Operating System	westerndigital	my_cloud_dl2100_firmware	< 2.31.183	Yes
Hardware	westerndigital	my_cloud_dl2100	-	No
Operating System	westerndigital	my_cloud_dl4100_firmware	< 2.31.183	Yes
Hardware	westerndigital	my_cloud_dl4100	-	No
Operating System	westerndigital	my_cloud_pr2100_firmware	< 2.31.183	Yes
Hardware	westerndigital	my_cloud_pr2100	-	No
Operating System	westerndigital	my_cloud_pr4100_firmware	< 2.31.183	Yes
Hardware	westerndigital	my_cloud_pr4100	-	No

References

https://bnbdr.github.io/posts/wd/ Exploit, Third Party Advisory ([email protected])
https://community.wd.com/t/new-release-my-cloud-firmware-versions-2-31-183-05-20-2019/237717 Vendor Advisory ([email protected])
https://github.com/bnbdr/wd-rce/ Exploit, Third Party Advisory ([email protected])
https://bnbdr.github.io/posts/wd/ Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://community.wd.com/t/new-release-my-cloud-firmware-versions-2-31-183-05-20-2019/237717 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/bnbdr/wd-rce/ Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For westerndigital's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.