Vulnerability · Published Jul 10, 2025 · Assigned by Honeywell
CVE-2025-3947Integer underflow during processing of short network packets in CDA FTEB responder
High 8.2
In plain English
A high-severity security flaw in C200E from Honeywell. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Honeywell | C300 PCNT02 | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | C300 PCNT05 | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | FIM4 | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | FIM8 | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | UOC | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | CN100 | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | HCA | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | C300PM | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | C200E | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
Weakness: CWE-191 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H