CVE-2021-28149

Name: CVE-2021-28149
Creator: NVD / NIST
Published: 2021-05-06T16:15:07.33+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 13.75%

Last modified Jun 17, 2026

CVE-2021-28149 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 13.75% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

13.75%

96.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Hongdian	H8922 Firmware	3.0.5

References

http://en.hongdian.com/Products/Details/H8922Product, Vendor Advisory
https://ssd-disclosure.com/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/Exploit, Third Party Advisory
http://en.hongdian.com/Products/Details/H8922Product, Vendor Advisory
https://ssd-disclosure.com/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/Exploit, Third Party Advisory

Timeline

Published: May 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28149?

How severe is CVE-2021-28149?

CVE-2021-28149 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 13.75% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28149?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28149?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST