CVE-2025-3946Network attack vector

Remote code execution via misrouted FTEB packets

Published Jul 10, 2025 · Updated Aug 4, 2025

Deployment of Wrong Handler in Honeywell Experion PKS and OneWireless WDM allows remote attackers to execute code through crafted CDA packets. The CDA component routes FTEB protocol input to an incorrect handler, causing crafted packets to be processed as an unintended message type. Network access without authentication or user interaction is sufficient; execution can manipulate data and interrupt affected control functions.

CVSS severity8.2
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deployment of Wrong Handler in Honeywell Experion PKS and OneWireless WDM allows remote attackers to execute code through crafted CDA packets. The CDA component routes FTEB protocol input to an incorrect handler, causing crafted packets to be processed as an unintended message type. Network access without authentication or user interaction is sufficient; execution can manipulate data and interrupt affected control functions.

The record

CVE
CVE-2025-3946
Published
Jul 10, 2025
Updated
Aug 4, 2025
Vendor
Honeywell Technologies
Product
C200E
Classifications
CWE-430, T0866
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=520.1 <=520.2 TCU9
  2. Affected versionversion=530 <=530 TCU3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Honeywell Technologies · C200Eversion=520.1 <=520.2 TCU9; version=530 <=530 TCU3
Honeywell Technologies · FIM4version=520.1 <=520.2 TCU9; version=530 <=530 TCU3
Honeywell Technologies · C300 PCNT05version=520.1 <=520.2 TCU9; version=530 <=530 TCU3
Honeywell Technologies · CN100version=520.1 <=520.2 TCU9; version=530 <=530 TCU3
Honeywell Technologies · C300PMversion=520.1 <=520.2 TCU9; version=530 <=530 TCU3
Honeywell Technologies · Wireless Device Managerversion=322.1 <=322.4; version=330.1 <=330.3
Honeywell Technologies · UOCversion=520.1 <=520.2 TCU9; version=530 <=530 TCU3
Honeywell Technologies · FIM8version=520.1 <=520.2 TCU9; version=530 <=530 TCU3
Honeywell Technologies · C300 PCNT02version=520.1 <=520.2 TCU9; version=530 <=530 TCU3
Honeywell Technologies · HCAversion=520.1 <=520.2 TCU9; version=530 <=530 TCU3

Published CVSS scores

8.2Honeywell International Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-430Deployment of Wrong Handler
T0866Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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