What is CVE-2020-3924?

CVE-2020-3924 is a medium-severity vulnerability in Tonnet Dvr, classified under Command Injection. CVSS score: 6.4/10. Published 2020-02-27.

How severe is CVE-2020-3924?

Medium severity. CVSS v3 base score is 6.4 out of 10.

RCE in Tonnet Dvr

CVE-2020-3924

DVR firmware in TAT-76 and TAT-77 series of products, provided by TONNET do not properly verify patch files. Attackers can inject a specific command into a patch file and gain access to the system.

Vulnerability class: Command Injection (OS Command Injection)

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

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (68.5th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-77 — Command Injection

References

www.chtsecurity.com/news/4ef5eb3a-fdc3-4d78-8dd7-ec7213e2bbcf (Third Party Advisory)
tvn.twcert.org.tw/taiwanvn/TVN-201910004 (Third Party Advisory)

Frequently asked questions

What is CVE-2020-3924?: CVE-2020-3924 is a medium-severity vulnerability in Tonnet Dvr, classified under Command Injection. CVSS score: 6.4/10. Published 2020-02-27.
How severe is CVE-2020-3924?: Medium severity. CVSS v3 base score is 6.4 out of 10.