What is CVE-2019-20076?

CVE-2019-20076 is a medium-severity vulnerability in Netis-Systems Dl4343, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-12-30.

How severe is CVE-2019-20076?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Netis-Systems Dl4343

CVE-2019-20076

On Netis DL4323 devices, XSS exists via the form2Ddns.cgi username parameter (DynDns settings of the Dynamic DNS Configuration).

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-12-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.015 (73.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

drive.google.com/open (Exploit, Third Party Advisory)
drive.google.com/open (Exploit, Third Party Advisory)
fatihhcelik.blogspot.com/2019/12/stored-xss-on-username-input-2-netis.html (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-20076?: CVE-2019-20076 is a medium-severity vulnerability in Netis-Systems Dl4343, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-12-30.
How severe is CVE-2019-20076?: Medium severity. CVSS v3 base score is 6.1 out of 10.