What is CVE-2020-3923?

CVE-2020-3923 is a high-severity vulnerability in Tonnet Dvr, classified under Improper Authentication. CVSS score: 8.1/10. Published 2020-02-27.

How severe is CVE-2020-3923?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in Tonnet Dvr

CVE-2020-3923

DVR firmware in TAT-76 and TAT-77 series of products, provided by TONNET, contain misconfigured authentication mechanism. Attackers can crack the default password and gain access to the system.

Vulnerability class: Broken Authentication

Published 2020-02-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.1th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

tvn.twcert.org.tw/taiwanvn/TVN-201910003 (Third Party Advisory)
www.chtsecurity.com/news/4ef5eb3a-fdc3-4d78-8dd7-ec7213e2bbcf (Third Party Advisory)

Frequently asked questions

What is CVE-2020-3923?: CVE-2020-3923 is a high-severity vulnerability in Tonnet Dvr, classified under Improper Authentication. CVSS score: 8.1/10. Published 2020-02-27.
How severe is CVE-2020-3923?: High severity. CVSS v3 base score is 8.1 out of 10.