Is CVE-2021-23147 actively exploited?

No active exploitation of CVE-2021-23147 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-23147 be exploited remotely?

No. CVE-2021-23147 requires physical access to exploit.

What is the CVSS score of CVE-2021-23147?

CVE-2021-23147 has a CVSS score of 6.8 (MEDIUM).

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MEDIUM

CVE-2021-23147

CWE-287Published: December 30, 2021· Updated: Jun 17, 2026

6.8

CVSS v3.1

Official Description

Netgear Nighthawk R6700 version 1.0.4.120 does not have sufficient protections for the UART console. A malicious actor with physical access to the device is able to connect to the UART port via a serial connection and execute commands as the root user without authentication.

NVD Source

Technical Analysis

CVE-2021-23147 requires local access, meaning attackers must already have a foothold on the target system.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 6.8.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.