Is CVE-2018-21195 actively exploited?

No active exploitation of CVE-2018-21195 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-21195 be exploited remotely?

Partially. CVE-2018-21195 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2018-21195?

CVE-2018-21195 has a CVSS score of 6.8 (MEDIUM).

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MEDIUM

CVE-2018-21195

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

6.8

CVSS v3.1

Official Description

Certain NETGEAR devices are affected by a stack-based buffer overflow by an authenticated user. This affects D6100 before 1.0.0.57, D7800 before 1.0.1.34, R6100 before 1.0.1.20, R7500v2 before 1.0.3.24, R7800 before 1.0.2.40, R9000 before 1.0.3.6, WNDR3700v4 before 1.0.2.92, WNDR4300 before 1.0.2.94, WNDR4300v2 before 1.0.0.50, WNDR4500v3 before 1.0.0.50, and WNR2000v5 before 1.0.0.62.

NVD Source

Technical Analysis

CVE-2018-21195 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

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

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-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.