What is CVE-2021-20164?

CVE-2021-20164 is a medium-severity vulnerability in Trendnet Tew-827dru, classified under Insufficiently Protected Credentials. CVSS score: 4.9/10. Published 2021-12-30.

How severe is CVE-2021-20164?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Vulnerability in Trendnet Tew-827dru

CVE-2021-20164

Trendnet AC2600 TEW-827DRU version 2.08B01 improperly discloses credentials for the smb functionality of the device. Usernames and passwords for all smb users are revealed in plaintext on the smbserver.asp page.

Published 2021-12-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (52.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Trendnet Tew-827dru — versions 2.0
Trendnet Tew-827dru Firmware — versions 2.08b01
Trendnet Ac2600 Tew-827dru — versions 2.08B01

Weakness classification (CWE)

CWE-522 — Insufficiently Protected Credentials

References

www.tenable.com/security/research/tra-2021-54 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-20164?: CVE-2021-20164 is a medium-severity vulnerability in Trendnet Tew-827dru, classified under Insufficiently Protected Credentials. CVSS score: 4.9/10. Published 2021-12-30.
How severe is CVE-2021-20164?: Medium severity. CVSS v3 base score is 4.9 out of 10.