CVE-2026-4183 D-Link DIR-816 goahead form2WlanBasicSetup.cgi stack-based overflow

Critical 9.3 Published 15 Mar 2026 Updated 16 Mar 2026

Remote attackers can trigger a stack-based buffer overflow in the D-Link DIR-816 router's web interface, potentially executing arbitrary code on the unsupported device.

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-2026-4183?

CVE-2026-4183 is a critical memory corruption vulnerability in Dlink Dir-816 Firmware, published on 15 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A security vulnerability has been detected in D-Link DIR-816 1.10CNB05. Affected is an unknown function of the file /goform/form2WlanBasicSetup.cgi of the component goahead. Such manipulation of the argument pskValue leads to stack-based buffer overflow. The attack can be executed remotely. The exploit has been disclosed publicly and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-121, CWE-787, CWE-119

Which versions are affected by CVE-2026-4183?

It affects 1 product.

Products include Dlink Dir-816 Firmware.

How do I fix CVE-2026-4183?

No fix has been published for CVE-2026-4183 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-4183 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4183 exists.

All Dlink Dir-816 Firmware vulnerabilities

Sources

Also known as GHSA-f27h-vmvh-757r.