CVE-2021-20151 Auth bypass in Trendnet AC2600 TEW-827DRU

Critical 10.0 Published 30 Dec 2021 Updated 3 Aug 2024

Attackers can hijack web sessions by spoofing IP addresses due to IP-based session management, allowing unauthorized access to the router interface.

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-2021-20151?

CVE-2021-20151 is a critical authentication bypass 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 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.

Weakness: CWE-384

Which versions are affected by CVE-2021-20151?

It affects 1 product.

Products include Trendnet Tew-827dru Firmware.

How do I fix CVE-2021-20151?

No fix has been published for CVE-2021-20151 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2021-20151 being exploited?

There is no known exploitation of CVE-2021-20151 in the wild and no public exploit code.

Sources

Also known as GHSA-hqq7-2rg7-fxx5.