CVE-2021-28150
Published: April 11, 2026
Official Description
Hongdian H8922 3.0.5 devices allow the unprivileged guest user to read cli.conf (with the administrator password and other sensitive data) via /backup2.cgi.
Risk Analysis
Hongdian H8922 devices allow an unprivileged guest user to read sensitive configuration files, including administrator passwords. This information disclosure can lead to further compromise of the device. The confirmed exploitation in the wild highlights its severity.
This vulnerability is actively exploited in the wild and is included in CISA's KEV catalog. It can be exploited remotely by an unprivileged guest user.
Update Hongdian H8922 devices to a patched version if available. Restrict access to sensitive configuration files and ensure proper authentication and authorization controls are in place.
Technical Analysis
CVE-2021-28150 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-2021-28150 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-2021-28150 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