CVE-2021-20151: trendnet tew-827dru_firmware Session Fixation

Vulnerability summary

CVE-2021-20151 is a critical (CVSS 10.0) Session Fixation vulnerability in trendnet tew-827dru_firmware. EPSS estimates a 1.61% chance of exploitation in the next 30 days, higher than 75.7% of scored vulnerabilities.

Timeline

1. 30-12-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

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.

• CWE-384Session FixationAuthenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.