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Fencer Vulns
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 2019-05-23 7 y ago modified 2026-06-17 4 mo 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

Exploit prediction

3.00% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 Vulns 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.