CVE-2021-31802 Memory corruption in n/a
A heap-based buffer overflow in NETGEAR R7000 routers allows unauthenticated attackers on the local network to execute arbitrary code as root via a crafted HTTP request.
- 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-2021-31802?
CVE-2021-31802 is a high-severity memory corruption vulnerability in Netgear R7000 Firmware, published on 26 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
NETGEAR R7000 1.0.11.116 devices have a heap-based Buffer Overflow that is exploitable from the local network without authentication. The vulnerability exists within the handling of an HTTP request. An attacker can leverage this to execute code as root. The problem is that a user-provided length value is trusted during a backup.cgi file upload. The attacker must add a \n before the Content-Length header.
Weakness: CWE-787
Which versions are affected by CVE-2021-31802?
It affects 1 product.
Products include Netgear R7000 Firmware.
How do I fix CVE-2021-31802?
No fix has been published for CVE-2021-31802 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-2021-31802 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-31802 exists.
Public exploit code: 1 Metasploit module.
Other vulnerabilities in Netgear R7000 Firmware
Sources
Also known as GHSA-89v8-28p6-p87r.