TI-2021-15999 Aliases CVE-2021-38395 GHSA-cqmh-9h94-59vr

Honeywell Experion PKS and ACE Controllers Injection

MEDIUM 50CWE-74Published 2022-10-28 · Updated 2025-04-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

Honeywell Experion PKS C200, C200E, C300, and ACE controllers are vulnerable to improper neutralization of special elements in output, which may allow an attacker to remotely execute arbitrary code and cause a denial-of-service condition.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01152 67th percentileScored 2026-11-08

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Honeywell	Experion PKS	C200; C200E; C300; ACE controllers	—	No fix listed	CNA

Experion PKS VendorHoneywell Affected C200; C200E; C300; ACE controllers Fixed in — No fix listed CNA

CPE configurations NVD · 8

CPE	Versions	Role	Vendor
cpe:2.3:o:honeywell:c200_firmware:-:::::::*	not specified by NVD	Vulnerable	Honeywell
cpe:2.3:h:honeywell:c200:-:::::::*	not specified by NVD	Running on	Honeywell
cpe:2.3:o:honeywell:c200e_firmware:-:::::::*	not specified by NVD	Vulnerable	Honeywell
cpe:2.3:h:honeywell:c200e:-:::::::*	not specified by NVD	Running on	Honeywell
cpe:2.3:o:honeywell:c300_firmware:-:::::::*	not specified by NVD	Vulnerable	Honeywell
cpe:2.3:h:honeywell:c300:-:::::::*	not specified by NVD	Running on	Honeywell
cpe:2.3:o:honeywell:application_control_environment_firmware:-:::::::*	not specified by NVD	Vulnerable	Honeywell
cpe:2.3:h:honeywell:application_control_environment:-:::::::*	not specified by NVD	Running on	Honeywell

cpe:2.3:o:honeywell:c200_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Honeywell
cpe:2.3:h:honeywell:c200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Honeywell
cpe:2.3:o:honeywell:c200e_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Honeywell
cpe:2.3:h:honeywell:c200e:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Honeywell
cpe:2.3:o:honeywell:c300_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Honeywell
cpe:2.3:h:honeywell:c300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Honeywell
cpe:2.3:o:honeywell:application_control_environment_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Honeywell
cpe:2.3:h:honeywell:application_control_environment:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Honeywell

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-38395
2026-10-03 Alias added: GHSA-cqmh-9h94-59vr

References

Advisory 1

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

Other 1

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

TI-2021-16001 Honeywell Experion PKS and ACE Controllers Unrestricted Upload of File with Dangerous Type CVSS 3.1CRITICAL 10.0
TI-2021-16003 Honeywell Experion PKS and ACE Controllers Relative Path Traversal CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences