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Vulnerability record · CVE-2019-9949 · published 23 May 2019

CVE-2019-9949: Westerndigital my cloud firmware link following vulnerability

Westerndigital · My Cloud Firmware

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.

8.8 CVSS 3.0 High EPSS 3.0% · top 13.2% CWE-59 · Link following
8.8CVSS 3.0 base score, v2 9.0
3.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
6References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bnbdr.github.io/posts/wd/ ExploitThird Party Advisory
https://community.wd.com/t/new-release-my-cloud-firmware-versions-2-31-183-05-20-2019/237717 Vendor Advisory
https://github.com/bnbdr/wd-rce/ ExploitThird Party Advisory
https://bnbdr.github.io/posts/wd/ ExploitThird Party Advisory
https://community.wd.com/t/new-release-my-cloud-firmware-versions-2-31-183-05-20-2019/237717 Vendor Advisory
https://github.com/bnbdr/wd-rce/ ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-9949), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.