Vulnerability · Published Jul 10, 2025 · Assigned by Honeywell
CVE-2025-2520Dereferencing of an uninitialized pointer leads to denial of service.
High 7.5
In plain English
A high-severity security flaw in C300 PCNT02 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 37% of all known vulnerabilities).
Official description
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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Honeywell | C300 PCNT02 | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | EHB | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | EHPM | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | ELMM | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | Classic ENIM | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | ETN | 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 | PGM | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
| Honeywell | RFIM | 520.1 – through 520.2 TCU9530 – through 530 TCU3 |
Weakness: CWE-457 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H