What is CVE-2021-38403?

CVE-2021-38403 is a medium-severity vulnerability in Delta Electronics Dialink, classified under Cross-site Scripting. CVSS score: 5.5/10. Published 2021-11-03.

How severe is CVE-2021-38403?

Medium severity. CVSS v3 base score is 5.5 out of 10.

XSS in Delta Electronics Dialink

CVE-2021-38403

Delta Electronics DIALink versions 1.2.4.0 and prior is vulnerable to cross-site scripting because an authenticated attacker can inject arbitrary JavaScript code into the parameter supplier of the API maintenance, which may allow an attacker to remotely execute code.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-11-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Delta Electronics Dialink — versions All
Deltaww Dialink

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

us-cert.cisa.gov/ics/advisories/icsa-21-294-02 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2021-38403?: CVE-2021-38403 is a medium-severity vulnerability in Delta Electronics Dialink, classified under Cross-site Scripting. CVSS score: 5.5/10. Published 2021-11-03.
How severe is CVE-2021-38403?: Medium severity. CVSS v3 base score is 5.5 out of 10.