What’s Vulnerable › Vulnerabilities

CVE-2021-38397: Honeywell Experion PKS and ACE Controllers Unrestricted Upload of File with Dangerous Type

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-10-28 · updated 2026-06-17
• Weakness: CWE-434

Description

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.

Affected products

• Honeywell Application Control Environment Firmware: all versions
• Honeywell C200 Firmware: all versions
• Honeywell C200E Firmware: all versions
• Honeywell C300: all versions

References

• https://www.cisa.gov/uscert/ics/advisories/icsa-21-278-04
• https://www.honeywellprocess.com/library/support/notifications/Customer/SN2021-02-22-01-Experion-C300-CCL.pdf
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-278-04
• https://www.honeywellprocess.com/library/support/notifications/Customer/SN2021-02-22-01-Experion-C300-CCL.pdf

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