CVE-2022-43621 Auth bypass in DIR-1935

High 8.8 Published 29 Mar 2023 Updated 18 Feb 2025

Network-adjacent attackers can bypass authentication on D-Link DIR-1935 routers due to flawed HNAP login request handling.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2022-43621?

CVE-2022-43621 is a high-severity authentication bypass vulnerability in D-Link DIR-1935, published on 29 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-1935 1.03 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of HNAP login requests. The issue results from an incorrectly implemented comparison. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-16152.

Weakness: CWE-697

Which versions are affected by CVE-2022-43621?

It affects 1 product.

Products include Dlink Dir-1935 Firmware.

How do I fix CVE-2022-43621?

No fix has been published for CVE-2022-43621 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2022-43621 being exploited?

There is no known exploitation of CVE-2022-43621 in the wild and no public exploit code.

Sources

Also known as GHSA-24q5-7fw8-5m7f.