CVE-2025-3946: Incorrect response generation during FTEB protocol processing

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-10 · updated 2026-06-17
Weakness: CWE-430

Description

The Honeywell Experion PKS and OneWireless WDM contains a Deployment of Wrong Handler vulnerability in the component Control Data Access (CDA). An attacker could potentially exploit this vulnerability, leading to Input Data Manipulation, which could result in incorrect handling of packets leading to remote code execution. Honeywell recommends updating to the most recent version of Honeywell Experion PKS:520.2 TCU9 HF1 and 530.1 TCU3 HF1 and OneWireless: 322.5 and 331.1. The affected Experion PKS products are C300 PCNT02, C300 PCNT05, FIM4, FIM8, UOC, CN100, HCA, C300PM, and C200E. The Experion PKS versions affected are from 520.1 through 520.2 TCU9 and from 530 through 530 TCU3. The OneWireless WDM affected versions are 322.1 through 322.4 and 330.1 through 330.3.

Affected products

Honeywell C200E: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell C300 PCNT02: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell C300 PCNT05: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell C300PM: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell CN100: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell FIM4: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell FIM8: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell HCA: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell UOC: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell Wireless Device Manager: from 322.1 through 322.4; from 330.1 through 330.3

References

https://process.honeywell.com/

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