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

CVSS 7.5 · High EPSS 0.37% · P59
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I. Basic Information for CVE-2025-2520

Vulnerability Information
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Vulnerability Title
Dereferencing of an uninitialized pointer leads to denial of service.
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用未经初始化的变量
Source: NVD (National Vulnerability Database)
Vulnerability Title
Honeywell Experion PKS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Honeywell Experion PKS是美国霍尼韦尔（Honeywell）公司的一个过程自动化系统。 Honeywell Experion PKS 520.1至520.2 TCU9和530至530 TCU3版本存在安全漏洞，该漏洞源于未初始化变量，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
HoneywellC300 PCNT02 520.1 ~ 520.2 TCU9 -
HoneywellEHB 520.1 ~ 520.2 TCU9 -
HoneywellEHPM 520.1 ~ 520.2 TCU9 -
HoneywellELMM 520.1 ~ 520.2 TCU9 -
HoneywellClassic ENIM 520.1 ~ 520.2 TCU9 -
HoneywellETN 520.1 ~ 520.2 TCU9 -
HoneywellFIM4 520.1 ~ 520.2 TCU9 -
HoneywellFIM8 520.1 ~ 520.2 TCU9 -
HoneywellPGM 520.1 ~ 520.2 TCU9 -
HoneywellRFIM 520.1 ~ 520.2 TCU9 -

II. Public POCs for CVE-2025-2520

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III. Intelligence Information for CVE-2025-2520

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Same Patch Batch · Honeywell · 2025-07-10 · 6 CVEs total

CVE-2025-25239.4 CRITICALLack of buffer clearing before reuse may result in incorrect system behavior.
CVE-2025-25218.6 HIGHLack of indexes’ validation against buffer borders leads to remote code execution.
CVE-2025-39478.2 HIGHInteger underflow during processing of short network packets in CDA FTEB responder
CVE-2025-39468.2 HIGHIncorrect response generation during FTEB protocol processing
CVE-2025-25226.5 MEDIUMLack of buffer clearing before reuse may result in incorrect system behavior.

IV. Related Vulnerabilities

Same product: C300 PCNT02
Same vendor: Honeywell
Same weakness: CWE-457

V. Comments for CVE-2025-2520

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