What is CVE-2021-40813?

CVE-2021-40813 is a medium-severity vulnerability in Element-It HTTP Commander, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-01-13.

How severe is CVE-2021-40813?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Element-It HTTP Commander

CVE-2021-40813

A cross-site scripting (XSS) vulnerability in the "Zip content" feature in Element-IT HTTP Commander 3.1.9 allows remote authenticated users to inject arbitrary web script or HTML via filenames.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-01-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (53.1th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Element-It HTTP Commander — versions 3.1.9

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.element-it.com/products.aspx (Product)
www.exploit-db.com/exploits/50645 (Exploit, VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-40813?: CVE-2021-40813 is a medium-severity vulnerability in Element-It HTTP Commander, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-01-13.
How severe is CVE-2021-40813?: Medium severity. CVSS v3 base score is 5.4 out of 10.