CVE-2021-38397

CRITICALNVD 10.010.0—

10.0

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.

CVSS v3: 10.0
EG Score: 10.0(medium)
EPSS: 59.2%
KEV: Not listed

Published

October 28, 2022

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated May 23, 2026

Patch available. Sources: cisa.

generic

Process Automation | Honeywell

https://www.honeywellprocess.com/library/support/notifications/Customer/SN2021-02-22-01-Experion-C300-CCL.pdf

cisa Patch Available

Honeywell Experion PKS and ACE Controllers | CISA

https://www.cisa.gov/uscert/ics/advisories/icsa-21-278-04

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-434Unrestricted Upload of File with Dangerous Type

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
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2026-05-31 22:29 UTCepss_batch
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2026-05-31 00:15 UTCepss_batch
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2026-05-29 13:42 UTCepss_batch
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2026-05-28 13:43 UTCepss_batch
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2026-05-27 13:39 UTCepss_batch
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2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-38397?

CVE-2021-38397 is a critical vulnerability published on October 28, 2022. 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.

When was CVE-2021-38397 disclosed?

CVE-2021-38397 was first published in the National Vulnerability Database on October 28, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-38397 actively exploited?

CVE-2021-38397 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 59.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-38397?

CVE-2021-38397 has a CVSS v3 base score of 10.0 (NVD).

How do I remediate CVE-2021-38397?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-38397, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-38397

📅 Published

🔄 Last Modified

📋 Advisory Details (2)