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Vulnerability record · CVE-2021-28149 · published 6 May 2021

CVE-2021-28149: Hongdian h8922 firmware path traversal vulnerability

Hongdian · H8922 Firmware

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.

6.5 CVSS 3.1 Medium EPSS 16% · top 3.2% CWE-22 · Path traversal
6.5CVSS 3.1 base score, v2 4.0
16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://en.hongdian.com/Products/Details/H8922 ProductVendor Advisory
https://ssd-disclosure.com/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/ ExploitThird Party Advisory
http://en.hongdian.com/Products/Details/H8922 ProductVendor Advisory
https://ssd-disclosure.com/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/ ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-28149), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.