What is CVE-2021-31558?

CVE-2021-31558 is a medium-severity vulnerability in Delta Electronics Diaenergie, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2021-12-22.

How severe is CVE-2021-31558?

Medium severity. CVSS v3 base score is 6.5 out of 10.

XSS in Delta Electronics Diaenergie

CVE-2021-31558

DIAEnergie Version 1.7.5 and prior is vulnerable to stored cross-site scripting when an unauthenticated user injects arbitrary code into the parameter “descr” of the script “DIAE_hierarchyHandler.ashx”.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-12-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.106 (95.7th percentile), scored 2026-10-03.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.106 · newest: 0.106 · change: 0.000

Affected products

Delta Electronics Diaenergie — versions All
Deltaww Diaenergie

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.cisa.gov/uscert/ics/advisories/icsa-21-238-03 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2021-31558?: CVE-2021-31558 is a medium-severity vulnerability in Delta Electronics Diaenergie, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2021-12-22.
How severe is CVE-2021-31558?: Medium severity. CVSS v3 base score is 6.5 out of 10.