CVE-2021-38397
criticalpriority · track · 40EPSS 0.012 · 68 %ileEURUUSEPSS · scored 2026-10-27
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.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
No vendor fix yet; a mitigation is available.
- MitigationC200cisa_csaf_ot
Honeywell recommends users follow all guidance in the Experion Network and Security Planning Guide to prevent attacks by malicious actors.
https://www.honeywellprocess.com/library/support/Documents/Experion/Network-and-Security-Planning-Guide-EPDOC-XX75-en-511C.pdf - MitigationC200Ecisa_csaf_ot
Honeywell recommends users follow all guidance in the Experion Network and Security Planning Guide to prevent attacks by malicious actors.
https://www.honeywellprocess.com/library/support/Documents/Experion/Network-and-Security-Planning-Guide-EPDOC-XX75-en-511C.pdf - MitigationC300 and ACE controllerscisa_csaf_ot
Honeywell recommends users follow all guidance in the Experion Network and Security Planning Guide to prevent attacks by malicious actors.
https://www.honeywellprocess.com/library/support/Documents/Experion/Network-and-Security-Planning-Guide-EPDOC-XX75-en-511C.pdf
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (17)
Products and version ranges known to be affected.
- honeywell application control environment firmwareall versionsnvdUScpe:2.3:o:honeywell:application_control_environment_firmware:*:*:*:*:*:*:*:*
advisories (1)
Vendor and ecosystem advisories describing this.
- ICSA-21-278-04Honeywell Experion PKS and ACE Controllers2021-10-05icsa · cisa_csaf_otUS
Successful exploitation of these vulnerabilities could lead to remote code execution and denial-of-service conditions.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- https://cxsecurity.com/cveshow/CVE-2021-38397/cnnvd
- https://us-cert.cisa.gov/ics/advisories/icsa-21-278-04cnnvd
- https://www.auscert.org.au/bulletins/ESB-2021.3308cnnvd
- https://www.cisa.gov/uscert/ics/advisories/icsa-21-278-04cnnvd
- https://www.cybersecurity-help.cz/vdb/SB2021100608cnnvd
- https://www.honeywellprocess.com/library/support/notifications/Customer/SN2021-02-22-01-Experion-C300-CCL.pdfcnnvd
- https://www.cisa.gov/uscert/ics/advisories/icsa-21-278-04enisa_euvd
- https://www.honeywellprocess.com/library/support/notifications/Customer/SN2021-02-22-01-Experion-C300-CCL.pdfenisa_euvd
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