CVE-2025-2520: Honeywell c300 PCNT02

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

The Honeywell Experion PKS contains an Uninitialized Variable in the common Epic Platform Analyzer (EPA) communications. An attacker could potentially exploit this vulnerability, leading to a Communication Channel Manipulation, which results in a dereferencing of an uninitialized pointer leading to a denial of service. Honeywell recommends updating to the most recent version of Honeywell Experion PKS: 520.2 TCU9 HF1and 530.1 TCU3 HF1. The affected Experion PKS products are C300 PCNT02, EHB, EHPM, ELMM, Classic ENIM, ETN, FIM4, FIM8, PGM, and RFIM. The Experion PKS versions affected are from 520.1 through 520.2 TCU9 and from 530 through 530 TCU3.

Affected products

• Honeywell c300 PCNT02: from 520.1, up to and including 520.2 TCU9; from 530, up to and including 530 TCU3
• Honeywell Classic Enim: from 520.1, up to and including 520.2 TCU9; from 530, up to and including 530 TCU3
• Honeywell Ehb: from 520.1, up to and including 520.2 TCU9; from 530, up to and including 530 TCU3
• Honeywell Ehpm: from 520.1, up to and including 520.2 TCU9; from 530, up to and including 530 TCU3
• Honeywell Elmm: from 520.1, up to and including 520.2 TCU9; from 530, up to and including 530 TCU3
• Honeywell Etn: from 520.1, up to and including 520.2 TCU9; from 530, up to and including 530 TCU3
• Honeywell FIM4: from 520.1, up to and including 520.2 TCU9; from 530, up to and including 530 TCU3
• Honeywell FIM8: from 520.1, up to and including 520.2 TCU9; from 530, up to and including 530 TCU3
• Honeywell Pgm: from 520.1, up to and including 520.2 TCU9; from 530, up to and including 530 TCU3
• Honeywell Rfim: from 520.1, up to and including 520.2 TCU9; from 530, up to and including 530 TCU3

Published 2025-07-10. Last modified 2026-06-17.