CVE-2025-3946 Incorrect response generation during FTEB protocol processing
An attacker can achieve remote code execution by exploiting incorrect packet handling in the Control Data Access component of Honeywell Experion PKS and OneWireless systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-3946?
CVE-2025-3946 is a high-severity code injection vulnerability in Honeywell C200E, published on 10 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-430
Which versions are affected by CVE-2025-3946?
How do I fix CVE-2025-3946?
No fix has been published for CVE-2025-3946 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2025-3946 being exploited?
There is no known exploitation of CVE-2025-3946 in the wild and no public exploit code.
Sources
Also known as GHSA-q4mp-gpc2-ghww.