Is CVE-2021-28149 actively exploited?

Yes. CVE-2021-28149 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-28149 be exploited remotely?

The attack vector of CVE-2021-28149 has not been classified yet.

What is the CVSS score of CVE-2021-28149?

CVE-2021-28149 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-28149

UNKNOWNCISA KEVIN THE WILD

CVE-2021-28149

Published: April 11, 2026

EPSS:90.66%probability of exploitation in 30 daysPercentile:99.6th

Official 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.

NVD Source

Technical Analysis

CVE-2021-28149 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-28149 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.