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Fencer Vulns
critical 9.8

CVE-2018-17153 in the critical feed json

It was discovered that the Western Digital My Cloud device before 2.30.196 is affected by an authentication bypass vulnerability.

published 2018-09-18 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-8928

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
86.6%
EPSS 86.6% chance of exploitation in 30 days, percentile 99.7%
public exploits
1
Metasploit, plus a Nuclei check

Summary

It was discovered that the Western Digital My Cloud device before 2.30.196 is affected by an authentication bypass vulnerability. An unauthenticated attacker can exploit this vulnerability to authenticate as an admin user without needing to provide a password, thereby gaining full control of the device. (Whenever an admin logs into My Cloud, a server-side session is created that is bound to the user's IP address. After the session is created, it is possible to call authenticated CGI modules by sending the cookie username=admin in the HTTP request. The invoked CGI will check if a valid session is present and bound to the user's IP address.) It was found that it is possible for an unauthenticated attacker to create a valid session without a login. The network_mgr.cgi CGI module contains a command called "cgi_get_ipv6" that starts an admin session -- tied to the IP address of the user making the request -- if the additional parameter "flag" with the value "1" is provided. Subsequent invocation of commands that would normally require admin privileges now succeed if an attacker sets the username=admin cookie.

Patch / fix

  • western_digital my_cloud_wdbctl0020hwt_firmware 2.30.196
  • western_digital my_cloud_pr4100 2.30.196
  • western_digital my_cloud_pr2100_firmware 2.30.196
  • western_digital my_cloud_mirror_gen_2_firmware 2.30.196
  • western_digital my_cloud_mirror_firmware 2.30.196
  • western_digital my_cloud_ex4100 2.30.196
  • western_digital my_cloud_ex4_firmware 2.30.196
  • western_digital my_cloud_ex2100_firmware 2.30.196
  • western_digital my_cloud_ex2_ultra_firmware 2.30.196
  • western_digital my_cloud_ex2_firmware 2.30.196
  • western_digital my_cloud_dl4100_firmware 2.30.196
  • western_digital my_cloud_dl2100 2.30.196

Timeline

  1. First public exploit (Metasploit exploit/linux/http/wd_mycloud_unauthenticated_cmd_injection)
  2. Published

Exploit prediction

86.59% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness

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.