Is CVE-2018-21135 actively exploited?

No active exploitation of CVE-2018-21135 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-21135 be exploited remotely?

Yes. CVE-2018-21135 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2018-21135?

CVE-2018-21135 has a CVSS score of 7.2 (HIGH).

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HIGH

CVE-2018-21135

CWE-787Published: April 23, 2020· Updated: Jun 17, 2026

7.2

CVSS v3.1

Official Description

Certain NETGEAR devices are affected by a stack-based buffer overflow by an authenticated user. This affects R6700 before 1.0.1.48, R7500 before 1.0.0.124, R7800 before 1.0.2.58, R8900 before 1.0.4.2, R9000 before 1.0.4.2, WNDR3700v4 before 1.0.2.102, WNDR4300v1 before 1.0.2.104, WNDR4300v2 before 1.0.0.56, WNDR4500v3 before 1.0.0.56, and WNR2000v5-R2000 before 1.0.0.68.

NVD Source

Technical Analysis

CVE-2018-21135 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

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 7.2.

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