CVE-2025-3947: Integer underflow during processing of short network packets in CDA FTEB responder

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-10 · updated 2026-06-17
Weakness: CWE-191

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

Honeywell C200E: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
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 C300PM: 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 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 HCA: 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

References

https://process.honeywell.com/

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