CVE-2025-3947

The Honeywell Experion PKS contains an Integer Underflow vulnerability in the component Control Data Access (CDA). An attacker could potentially exploit this vulnerability, leading to Input Data Manipulation, which could result in improper integer data value checking during subtraction leading to a denial of service. Honeywell recommends updating to the most recent version of Honeywell Experion PKS:520.2 TCU9 HF1 and 530.1 TCU3 HF1. 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.

Scoring

Severity

HIGH

CVSS base score

8.2

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

EPSS probability

0.33%

CWE

CWE-191

Published

2025-07-10

Last modified

2026-03-12

Affected products

• Honeywell C300 PCNT02
• Honeywell C300 PCNT02
• Honeywell C300 PCNT05
• Honeywell C300 PCNT05
• Honeywell FIM4
• Honeywell FIM4
• Honeywell FIM8
• Honeywell FIM8

Weakness type

• CWE-191

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