CVE-2026-5983 D-Link DIR-605L POST Request formSetDDNS buffer overflow

High 8.7 Published 9 Apr 2026 Updated 14 Apr 2026

Remote attackers can trigger a buffer overflow in the DDNS handler of unsupported D-Link routers, potentially leading to code execution or service disruption.

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

What is CVE-2026-5983?

CVE-2026-5983 is a high-severity memory corruption vulnerability in Dlink Dir-605l Firmware, published on 9 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability was determined in D-Link DIR-605L 2.13B01. This issue affects the function formSetDDNS of the file /goform/formSetDDNS of the component POST Request Handler. Executing a manipulation of the argument curTime can lead to buffer overflow. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized. This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-120, CWE-119

Which versions are affected by CVE-2026-5983?

It affects 1 product.

Products include Dlink Dir-605l Firmware.

How do I fix CVE-2026-5983?

No fix has been published for CVE-2026-5983 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-2026-5983 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5983 exists.

All Dlink Dir-605l Firmware vulnerabilities

Sources

Also known as GHSA-3vj3-fr37-rf37.