CVE-2021-20151

Severity: critical (CVSS 10.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-12-30 · updated 2026-06-17
Weakness: CWE-384

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.

Affected products

Trendnet AC2600 TEW-827DRU: 2.08b01

References

https://www.tenable.com/security/research/tra-2021-54
https://www.tenable.com/security/research/tra-2021-54

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