CVE-2026-1685 D-Link DIR-823X Login sub_40AC74 excessive authentication

Medium 6.3 Published 30 Jan 2026 Updated 23 Feb 2026

Remote attackers can bypass login rate limiting on D-Link DIR-823X routers, facilitating brute-force attacks despite high complexity.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-1685?

CVE-2026-1685 is a medium-severity vulnerability in D-Link DIR-823X, published on 30 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability was identified in D-Link DIR-823X 250416. This vulnerability affects the function sub_40AC74 of the component Login. Such manipulation leads to improper restriction of excessive authentication attempts. The attack may be performed from remote. This attack is characterized by high complexity. It is stated that the exploitability is difficult. The exploit is publicly available and might be used.

Weakness: CWE-799, CWE-307

Which versions are affected by CVE-2026-1685?

It affects 1 product.

Products include Dlink Dir-823x Firmware.

How do I fix CVE-2026-1685?

No fix has been published for CVE-2026-1685 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-1685 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1685 exists.

Sources

Also known as GHSA-4h4g-2r65-5v68.