CVE-2025-10666 D-Link DIR-825 apply.cgi sub_4106d4 buffer overflow

High 8.7 Published 18 Sep 2025 Updated 3 Feb 2026

Remote attackers can trigger a buffer overflow in the D-Link DIR-825 router's apply.cgi script, potentially leading to code execution or denial of service.

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-2025-10666?

CVE-2025-10666 is a high-severity memory corruption vulnerability in D-Link DIR-825, published on 18 Sep 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A security flaw has been discovered in D-Link DIR-825 up to 2.10. Affected by this vulnerability is the function sub_4106d4 of the file apply.cgi. The manipulation of the argument countdown_time results in buffer overflow. The attack can be executed remotely. The exploit has been released to the public and may be exploited. This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-120, CWE-119

Which versions are affected by CVE-2025-10666?

It affects 1 product.

Products include Dlink Dir-825 Firmware.

How do I fix CVE-2025-10666?

No fix has been published for CVE-2025-10666 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-2025-10666 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-10666 exists.

Public exploit code: 1 Exploit-DB entry.

Sources

Also known as GHSA-xvh8-f5vg-49g2.