What is CVE-2021-20154?

CVE-2021-20154 is a high-severity vulnerability in Trendnet Tew-827dru, classified under Cleartext Transmission of Sensitive Information. CVSS score: 7.5/10. Published 2021-12-30.

How severe is CVE-2021-20154?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-20154 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Trendnet Tew-827dru

CVE-2021-20154

Trendnet AC2600 TEW-827DRU version 2.08B01 contains an security flaw in the web interface. HTTPS is not enabled on the device by default. This results in cleartext transmission of sensitive information such as passwords.

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

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (53.8th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · 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-319 — Cleartext Transmission of Sensitive Information

Public proof-of-concept exploits

References

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

Frequently asked questions

What is CVE-2021-20154?: CVE-2021-20154 is a high-severity vulnerability in Trendnet Tew-827dru, classified under Cleartext Transmission of Sensitive Information. CVSS score: 7.5/10. Published 2021-12-30.
How severe is CVE-2021-20154?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-20154 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.