CVE-2025-4140 Netgear EX6120 sub_30394 buffer overflow

High 8.7 Published 30 Apr 2025 Updated 2 May 2025

Remote attackers can trigger a buffer overflow in the Netgear EX6120 via the host argument, potentially leading to code execution.

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-2025-4140?

CVE-2025-4140 is a high-severity memory corruption vulnerability in Netgear EX6120, published on 30 Apr 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability, which was classified as critical, has been found in Netgear EX6120 1.0.3.94. Affected by this issue is the function sub_30394. The manipulation of the argument host leads to buffer overflow. The attack may be launched remotely. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-120, CWE-119

Which versions are affected by CVE-2025-4140?

It affects 1 product.

Products include Netgear Ex6120 Firmware.

How do I fix CVE-2025-4140?

No fix has been published for CVE-2025-4140 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-2025-4140 being exploited?

There is no known exploitation of CVE-2025-4140 in the wild and no public exploit code.

Sources

Also known as GHSA-mf3m-m2fx-pq76.