Is CVE-2021-20158 actively exploited?

No active exploitation of CVE-2021-20158 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-20158 be exploited remotely?

Yes. CVE-2021-20158 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-20158?

CVE-2021-20158 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-20158

CRITICAL

CVE-2021-20158

CWE-306Published: December 30, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Trendnet AC2600 TEW-827DRU version 2.08B01 contains an authentication bypass vulnerability. It is possible for an unauthenticated, malicous actor to force the change of the admin password due to a hidden administrative command.

NVD Source

Technical Analysis

CVE-2021-20158 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

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 9.8.