Is CVE-2021-20151 actively exploited?

No active exploitation of CVE-2021-20151 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-20151 be exploited remotely?

Yes. CVE-2021-20151 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-20151?

CVE-2021-20151 has a CVSS score of 10.0 (CRITICAL).

HOME VULNERABILITIESCVE-2021-20151

CRITICAL

CVE-2021-20151

CWE-384Published: December 30, 2021· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official Description

Trendnet AC2600 TEW-827DRU version 2.08B01 contains a flaw in the session management for the device. The router's management software manages web sessions based on IP address rather than verifying client cookies/session tokens/etc. This allows an attacker (whether from a different computer, different web browser on the same machine, etc.) to take over an existing session. This does require the attacker to be able to spoof or take over original IP address of the original user's session.

NVD Source

Technical Analysis

CVE-2021-20151 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 10.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.