CVE-2020-15635 Memory corruption in R6700

High 8.8 Published 19 Aug 2020 Updated 4 Aug 2024

Network-adjacent attackers can execute arbitrary code as admin on NETGEAR R6700 routers via a stack buffer overflow in the acsd service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-15635?

CVE-2020-15635 is a high-severity memory corruption vulnerability in Netgear R6700 Firmware, published on 19 Aug 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6700 V1.0.4.84_10.0.58 routers with firmware 1.0.4.84_10.0.58. Authentication is not required to exploit this vulnerability. The specific flaw exists within the acsd service, which listens on TCP port 5916 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the admin user. Was ZDI-CAN-9853.

Weakness: CWE-121

Which versions are affected by CVE-2020-15635?

It affects 1 product.

Products include Netgear R6700 Firmware.

How do I fix CVE-2020-15635?

No fix has been published for CVE-2020-15635 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-2020-15635 being exploited?

There is no known exploitation of CVE-2020-15635 in the wild and no public exploit code.

All Netgear R6700 Firmware vulnerabilities

Sources

Also known as GHSA-mw3v-c98c-6mmw.