CVE-2021-28151
Published: April 11, 2026
Official Description
Hongdian H8922 3.0.5 devices allow OS command injection via shell metacharacters into the ip-address (aka Destination) field to the tools.cgi ping command, which is accessible with the username guest and password guest.
Risk Analysis
Hongdian H8922 devices are vulnerable to OS command injection through the ping command, accessible with guest credentials. This allows an attacker to execute arbitrary commands on the device. Active exploitation makes this a critical vulnerability.
This vulnerability is actively exploited in the wild and is listed in CISA's KEV catalog. It can be exploited remotely by an authenticated guest user.
Update Hongdian H8922 devices to a patched version if available. Implement strict input validation and sanitization for all user-supplied commands to prevent command injection.
Technical Analysis
CVE-2021-28151 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-2021-28151 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.
Exploit & PoC Resources
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-28151 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1