CVE-2025-2520

highpriority · track · 0EPSS 0.004 · 36 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.42% (36th) EPSS

CVSS 7.5 · high

Is it mine?

26 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-26

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedExperion PKScisa_csaf_ot
Honeywell recommends updating Experion PKS R520.2 TCU9 Hot Fix 1 or R530 TCU3 Hot Fix 1. For more information, see the Security Notice.
https://process.honeywell.com/us/en/support/technical-publication?search=SN2025

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CISA US

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · psirt@honeywell.comexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-457USCWE-457USCWE-457US

affected products (26)

Products and version ranges known to be affected.

Honeywell Experion PKS: <R520.2_TCU9_Hot_Fix_1all versionscisa_csaf_otUS
Honeywell Experion PKS: <R530_TCU3_Hot_Fix_1all versionscisa_csaf_otUS
Honeywell Experion PKS< R520.2_TCU9_Hot_Fix_1cisa_csaf_otUS
Honeywell Experion PKS< R530_TCU3_Hot_Fix_1cisa_csaf_otUS
Honeywell C300 PCNT02≤ 530 ≤530 TCU3enisa_euvdEU
Honeywell C300 PCNT02≤ 520.1 ≤520.2 TCU9enisa_euvdEU
Honeywell Classic ENIM≤ 520.1 ≤520.2 TCU9enisa_euvdEU
Honeywell Classic ENIM≤ 530 ≤530 TCU3enisa_euvdEU
Honeywell EHB≤ 520.1 ≤520.2 TCU9enisa_euvdEU
Honeywell EHB≤ 530 ≤530 TCU3enisa_euvdEU
Honeywell EHPM≤ 530 ≤530 TCU3enisa_euvdEU
Honeywell EHPM≤ 520.1 ≤520.2 TCU9enisa_euvdEU
Honeywell ELMM≤ 520.1 ≤520.2 TCU9enisa_euvdEU
Honeywell ELMM≤ 530 ≤530 TCU3enisa_euvdEU
Honeywell ETN≤ 520.1 ≤520.2 TCU9enisa_euvdEU
Honeywell ETN≤ 530 ≤530 TCU3enisa_euvdEU
Honeywell FIM4≤ 530 ≤530 TCU3enisa_euvdEU
Honeywell FIM4≤ 520.1 ≤520.2 TCU9enisa_euvdEU
Honeywell FIM8≤ 520.1 ≤520.2 TCU9enisa_euvdEU
Honeywell FIM8≤ 530 ≤530 TCU3enisa_euvdEU

showing 20 of 26

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-25-205-03Honeywell Experion PKS (Update A)2025-07-24icsa · cisa_csaf_otUS
Successful exploitation of these vulnerabilities could result in information exposure, denial of service, or remote code execution.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot NVD CVE.org MITRE

published 2025-07-10modified 2026-06-17

references (5)

External citations — patches, advisories, analysis.

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