Skip to content
Fencer Intel
high 8.8

CVE-2019-9949 json

Western Digital My Cloud Cloud, Mirror Gen2, EX2 Ultra, EX2100, EX4100, DL2100, DL4100, PR2100 and PR4100 before firmware 2.31.183 are affe…

published 7y ago modified 4mo ago also EUVD-2019-19303

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.0%
EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

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.

Patch / fix

  • westerndigital my_cloud_firmware 2.31.183
  • westerndigital my_cloud_mirror_gen2_firmware 2.31.183
  • westerndigital my_cloud_ex2_ultra_firmware 2.31.183
  • westerndigital my_cloud_ex2100_firmware 2.31.183
  • westerndigital my_cloud_ex4100_firmware 2.31.183
  • westerndigital my_cloud_dl2100_firmware 2.31.183
  • westerndigital my_cloud_dl4100_firmware 2.31.183
  • westerndigital my_cloud_pr2100_firmware 2.31.183
  • westerndigital my_cloud_pr4100_firmware 2.31.183

Is CVE-2019-9949 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Exploit prediction

3.00% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bnbdr.github.io https://bnbdr.github.io/posts/wd/ referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/bnbdr/wd-rce/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 9.0 AV:N/AC:L/Au:S/C:C/I:C/A:C

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.