CVE-2021-20149: TRENDnet Tew-827dru Firmware

Critical severity, CVSS 9.8. EPSS: 1.4% chance of exploitation in the next 30 days.

Trendnet AC2600 TEW-827DRU version 2.08B01 does not have sufficient access controls for the WAN interface. The default iptables ruleset for governing access to services on the device only apply to IPv4. All services running on the devices are accessible via the WAN interface via IPv6 by default.

Affected products

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

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