CVE-2021-28149: Hongdian h8922 Firmware

Medium severity, CVSS 6.5. EPSS: 15.9% chance of exploitation in the next 30 days.

Hongdian H8922 3.0.5 devices allow Directory Traversal. The /log_download.cgi log export handler does not validate user input and allows a remote attacker with minimal privileges to download any file from the device by substituting ../ (e.g., ../../etc/passwd) This can be carried out with a web browser by changing the file name accordingly. Upon visiting log_download.cgi?type=../../etc/passwd and logging in, the web server will allow a download of the contents of the /etc/passwd file.

Affected products

• Hongdian h8922 Firmware: version 3.0.5 only

Published 2021-05-06. Last modified 2026-06-17.