CVE-2021-20165

Name: CVE-2021-20165
Creator: NVD / NIST
Published: 2021-12-30T22:15:09.363+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.62%

Last modified Jun 17, 2026

CVE-2021-20165 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Trendnet AC2600 TEW-827DRU version 2.08B01 does not properly implement csrf protections. Most pages lack proper usage of CSRF protections or mitigations. EPSS estimates a 0.62% chance of exploitation in the next 30 days.

Description

Trendnet AC2600 TEW-827DRU version 2.08B01 does not properly implement csrf protections. Most pages lack proper usage of CSRF protections or mitigations. Additionally, pages that do make use of CSRF tokens are trivially bypassable as the server does not appear to validate them properly (i.e. re-using an old token or finding the token thru some other method is possible).

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

0.62%

45.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Trendnet	Tew-827dru Firmware	2.08b01

References

https://www.tenable.com/security/research/tra-2021-54Exploit, Third Party Advisory
https://www.tenable.com/security/research/tra-2021-54Exploit, Third Party Advisory

Timeline

Published: Dec 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20165?

How severe is CVE-2021-20165?

CVE-2021-20165 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20165?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20165?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST