Cyber Resilience

CVE-2025-3946

Published
10 July 2025
Modified
17 June 2026
CVSS Score v3.1 8.2
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
EPSS Score 0.0047 38th percentile
Risk Priority 62 floored blend · peak EPSS

Summary

CVE-2025-3946 is a high-severity Deployment of Wrong Handler (CWE-430) vulnerability. Its CVSS base score is 8.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Space after Filename (T1036.006); ranked at the 38th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to CM-6 (Configuration Settings) and CM-2 (Baseline Configuration) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2025-3946 is a Deployment of Wrong Handler vulnerability (CWE-430) in the Control Data Access (CDA) component of Honeywell Experion PKS and OneWireless Wireless Device Manager (WDM). The affected Experion PKS products include C300 PCNT02, C300 PCNT05, FIM4, FIM8, UOC, CN100, HCA, C300PM, and C200E, with vulnerable versions spanning 520.1 through 520.2 TCU9 and 530 through 530 TCU3. For OneWireless WDM, the impacted versions are 322.1 through 322.4 and 330.1 through 330.3. The vulnerability has a CVSS v3.1 base score of 8.2 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H), indicating high severity due to its network accessibility and potential for significant impact.

An unauthenticated remote attacker can exploit this vulnerability over the network with low complexity and no user interaction required. Successful exploitation enables input data manipulation, which leads to incorrect handling of packets and ultimately remote code execution on the affected systems.

Honeywell advisories recommend updating to the latest versions for mitigation: Experion PKS to 520.2 TCU9 HF1 or 530.1 TCU3 HF1, and OneWireless WDM to 322.5 or 331.1. Additional details are available at https://process.honeywell.com/.

EU & UK References

Vulnerability Data

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…

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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.

CWE(s)
CWE-430

Related Threats

MITRE ATT&CK Enterprise Techniques

T1036.006 Space after Filename Stealth
Adversaries can hide a program's true filetype by changing the extension of a file.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

Affected Assets

—
C200E. The Experion PKS
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

CM-6 Configuration Settings good match

Documented restrictive configuration settings ensure the correct handler is assigned to each object type.

CM-2 Baseline Configuration partial match

Maintaining an approved baseline configuration directly stops incorrect handler assignments from being deployed.

CM-3 Configuration Change Control partial match

Change control and approval processes prevent erroneous handler deployments from reaching production.

SA-10 Developer Configuration Management partial match

Developer configuration management reduces the chance of wrong handlers being introduced during build or packaging.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-01 mostly match
prevents

Configuration management directly governs which handler processes which object type.

ID.AM-08 partial match
prevents

Life-cycle management encompasses deployment steps that can enforce correct handler assignment.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect incorrect handler assignments before deployment.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle includes handler registration and dispatch validation that prevents wrong-handler assignment.

A.8.26 Application security requirements partial match
prevents

Application security requirements can mandate explicit handler-to-object mapping rules.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles require correct component wiring and handler assignment.

A.8.28 Secure coding partial match
prevents

Secure coding standards can enforce correct handler registration and prevent mis-wiring.

A.8.32 Change management partial match
prevents

Change management verifies that handler mappings remain correct after updates.

References