Is CVE-2021-20155 actively exploited?

No active exploitation of CVE-2021-20155 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-20155 be exploited remotely?

Yes. CVE-2021-20155 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-20155?

CVE-2021-20155 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-20155

CWE-798Published: December 30, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Trendnet AC2600 TEW-827DRU version 2.08B01 makes use of hardcoded credentials. It is possible to backup and restore device configurations via the management web interface. These devices are encrypted using a hardcoded password of "12345678".

NVD Source

Technical Analysis

CVE-2021-20155 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.