CVE-2020-27866 Auth bypass in Multiple Routers
Network-adjacent attackers can bypass authentication on NETGEAR routers via flawed string matching in mini_httpd, potentially leading to root code execution.
- 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-2020-27866?
CVE-2020-27866 is a high-severity authentication bypass vulnerability in Netgear R6020 Firmware, published on 11 Feb 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 bypass authentication on affected installations of NETGEAR R6020, R6080, R6120, R6220, R6260, R6700v2, R6800, R6900v2, R7450, JNR3210, WNR2020, Nighthawk AC2100, and Nighthawk AC2400 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the mini_httpd service, which listens on TCP port 80 by default. The issue results from incorrect string matching logic when accessing protected pages. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of root. Was ZDI-CAN-11355.
Which versions are affected by CVE-2020-27866?
It affects 19 products.
Products include Netgear Ac2100 Firmware, Netgear Ac2400 Firmware, Netgear Ac2600 Firmware, Netgear R6020 Firmware, Netgear R6080 Firmware, Netgear R6120 Firmware and 13 more.
How do I fix CVE-2020-27866?
No fix has been published for CVE-2020-27866 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2020-27866 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-27866 exists.
Public exploit code: 1 Nuclei template.
Other vulnerabilities in Netgear R6020 Firmware
Sources
Also known as GHSA-mj6p-ghhj-r3q4.