CVE-2021-34991 Memory corruption in R6400v2
Network-adjacent attackers can execute arbitrary code as root on NETGEAR R6400v2 routers via a stack buffer overflow in the UPnP 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-2021-34991?
CVE-2021-34991 is a high-severity memory corruption vulnerability in Netgear D6220 Firmware, published on 15 Nov 2021. 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 R6400v2 1.0.4.106_10.0.80 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the UPnP service, which listens on TCP port 5000 by default. When parsing the uuid request header, the process does not properly validate 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 root. Was ZDI-CAN-14110.
Which versions are affected by CVE-2021-34991?
It affects 44 products.
Products include Netgear Cax80 Firmware, Netgear D6220 Firmware, Netgear D6400 Firmware, Netgear D7000v2 Firmware, Netgear Dc112a Firmware, Netgear Dgn2200v4 Firmware and 38 more.
How do I fix CVE-2021-34991?
No fix has been published for CVE-2021-34991 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-2021-34991 being exploited?
There is no known exploitation of CVE-2021-34991 in the wild and no public exploit code.
Other vulnerabilities in Netgear D6220 Firmware
Sources
Also known as GHSA-4fwh-3qpr-42ff.