Is CVE-2018-21206 actively exploited?

No active exploitation of CVE-2018-21206 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-21206 be exploited remotely?

Partially. CVE-2018-21206 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2018-21206?

CVE-2018-21206 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2018-21206

CWE-787Published: April 28, 2020· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

Certain NETGEAR devices are affected by a stack-based buffer overflow by an unauthenticated attacker. This affects D7800 before 1.0.1.30, EX2700 before 1.0.1.28, R6100 before 1.0.1.20, R7500 before 1.0.0.118, R7500v2 before 1.0.3.24, R7800 before 1.0.2.40, R9000 before 1.0.2.52, WN2000RPTv3 before 1.0.1.20, WN3000RPv3 before 1.0.2.50, WN3100RPv2 before 1.0.0.56, WNDR3700v4 before 1.0.2.96, WNDR4300 before 1.0.2.98, WNDR4300v2 before 1.0.0.50, and WNDR4500v3 before 1.0.0.50.

NVD Source

Technical Analysis

CVE-2018-21206 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

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 8.8.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.