Is CVE-2020-27866 actively exploited?

Yes. CVE-2020-27866 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2020-27866 be exploited remotely?

The attack vector of CVE-2020-27866 has not been classified yet.

What is the CVSS score of CVE-2020-27866?

CVE-2020-27866 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2020-27866

UNKNOWNCISA KEVIN THE WILD

CVE-2020-27866

Published: April 11, 2026

EPSS:90.78%probability of exploitation in 30 daysPercentile:99.6th

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.

NVD Source

Technical Analysis

CVE-2020-27866 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2020-27866 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.