CVE-2021-20151: TRENDnet Tew-827dru Firmware

Critical severity, CVSS 10.0. EPSS: 1.6% chance of exploitation in the next 30 days.

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.

Affected products

• TRENDnet Tew-827dru Firmware: version 2.08b01 only

Published 2021-12-30. Last modified 2026-06-17.