CVE-2020-27866 Explained : Impact and Mitigation

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR routers.

Understanding CVE-2020-27866

This CVE identifies a critical authentication bypass vulnerability in multiple NETGEAR router models.

What is CVE-2020-27866?

The vulnerability enables attackers to bypass authentication on specific NETGEAR router models without requiring any credentials.

The Impact of CVE-2020-27866

CVSS Base Score: 8.8 (High)
Attack Vector: Adjacent Network
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
The flaw allows attackers to execute code in the context of root without authentication.

Technical Details of CVE-2020-27866

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The flaw exists within the mini_httpd service on TCP port 80, due to incorrect string matching logic on protected pages.

Affected Systems and Versions

Affected Products: Multiple Routers
Vendor: NETGEAR
Affected Version: Firmware version 1.2.0.62_1.0.1

Exploitation Mechanism

Attackers exploit the vulnerability to bypass authentication and execute code as root.

Mitigation and Prevention

Protecting systems from this vulnerability is crucial.

Immediate Steps to Take

Update affected routers to the latest firmware version.
Monitor network traffic for any suspicious activities.
Restrict access to vulnerable devices.

Long-Term Security Practices

Regularly update router firmware to patch known vulnerabilities.
Implement strong network security measures to prevent unauthorized access.

Patching and Updates

Refer to NETGEAR's security advisory for detailed instructions on patching the vulnerability.