What is CVE-2021-38397?

CVE-2021-38397 is a critical-severity vulnerability in Honeywell Application Control Environment, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 10.0/10. Published 2022-10-28.

How severe is CVE-2021-38397?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Arbitrary file upload in Honeywell Application Control Environment

CVE-2021-38397

Honeywell Experion PKS C200, C200E, C300, and ACE controllers are vulnerable to unrestricted file uploads, which may allow an attacker to remotely execute arbitrary code and cause a denial-of-service condition.

Vulnerability class: Unrestricted File Upload

Published 2022-10-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (59.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

www.cisa.gov/uscert/ics/advisories/icsa-21-278-04 (US Government Resource, Third Party Advisory)
www.honeywellprocess.com/library/support/notifications/Customer/SN2021-02-22-01… (Product)

Frequently asked questions

What is CVE-2021-38397?: CVE-2021-38397 is a critical-severity vulnerability in Honeywell Application Control Environment, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 10.0/10. Published 2022-10-28.
How severe is CVE-2021-38397?: Critical severity. CVSS v3 base score is 10.0 out of 10.