CVE-2021-20155

Name: CVE-2021-20155
Creator: NVD / NIST
Published: 2021-12-30T22:15:08.847+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.90%

Last modified Jun 17, 2026

CVE-2021-20155 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Trendnet AC2600 TEW-827DRU version 2.08B01 makes use of hardcoded credentials. It is possible to backup and restore device configurations via the management web interface. EPSS estimates a 1.90% chance of exploitation in the next 30 days.

Description

Trendnet AC2600 TEW-827DRU version 2.08B01 makes use of hardcoded credentials. It is possible to backup and restore device configurations via the management web interface. These devices are encrypted using a hardcoded password of "12345678".

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.90%

77.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-798

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-2021-20155?

How severe is CVE-2021-20155?

CVE-2021-20155 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.90% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20155?

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-2021-20155?

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

Scan your code now

Source: NVD / NIST