CVE-2021-20149 Missing authorization in Trendnet AC2600 TEW-827DRU

Critical 9.8 Published 30 Dec 2021 Updated 3 Aug 2024

Attackers can access internal services via IPv6 on the WAN interface because default firewall rules only restrict IPv4 traffic.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-20149?

CVE-2021-20149 is a critical missing authorization vulnerability in Trendnet AC2600 TEW-827DRU, published on 30 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-863

Which versions are affected by CVE-2021-20149?

It affects 1 product.

Products include Trendnet Tew-827dru Firmware.

How do I fix CVE-2021-20149?

No fix has been published for CVE-2021-20149 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2021-20149 being exploited?

There is no known exploitation of CVE-2021-20149 in the wild and no public exploit code.

Sources

Also known as GHSA-5rm5-xp9h-jf8q.