CVE-2025-2520: Dereferencing of an uninitialized pointer leads to denial of service.

Severity: high (CVSS 7.5 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-457

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

Honeywell C300 PCNT02: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell Classic ENIM: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell EHB: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell EHPM: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell ELMM: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell ETN: 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 PGM: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3
Honeywell RFIM: from 520.1 through 520.2 TCU9; from 530 through 530 TCU3

References

https://process.honeywell.com/

Get alerted when CVE-2025-2520 or the next vulnerability affects your stack