CVE-2021-46442
Published: April 11, 2026
Official Description
In the "webupg" binary of D-Link DIR-825 G1, attackers can bypass authentication through parameters "autoupgrade.asp", and perform functions such as downloading configuration files and updating firmware without authorization.
Risk Analysis
A critical authentication bypass vulnerability in the "webupg" binary of D-Link DIR-825 G1 allows attackers to download configuration files and update firmware without authorization. The confirmed exploitation in the wild and inclusion in CISA's KEV catalog signify an urgent threat.
This vulnerability is actively exploited in the wild, as confirmed by its presence in CISA's KEV catalog. The authentication bypass can be exploited remotely to gain unauthorized control over the device.
Immediately apply any available firmware updates for D-Link DIR-825 G1. Restrict administrative access to the device and ensure strong, unique credentials are used for any remaining authenticated access.
Technical Analysis
CVE-2021-46442 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-2021-46442 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-2021-46442 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