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CVE-2025-3947— Integer underflow during processing of short network packets in CDA FTEB responder

Quick assessment

Affected
Honeywell C300 PCNT02
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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，该漏洞源于整数下溢，可能导致拒绝服务。

CVSS 8.2 · High EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-3947

Vulnerability Information
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Vulnerability Title
Integer underflow during processing of short network packets in CDA FTEB responder
Source: CVE Program / CVE List V5
Vulnerability Description
The Honeywell Experion PKS contains an Integer Underflow vulnerability in the component Control Data Access (CDA). An attacker could potentially exploit this vulnerability, leading to Input Data Manipulation, which could result in improper integer data value checking during subtraction leading to a denial of service. Honeywell recommends updating to the most recent version of Honeywell Experion PKS:520.2 TCU9 HF1 and 530.1 TCU3 HF1. The affected Experion PKS products are C300 PCNT02, C300 PCNT05, FIM4, FIM8, UOC, CN100, HCA, C300PM, and C200E. The Experion PKS versions affected are from 520.1 through 520.2 TCU9 and from 530 through 530 TCU3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
Honeywell Experion PKS 数字错误漏洞
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，该漏洞源于整数下溢，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

Vendor Product Affected Versions CPE Subscribe
Honeywell C300 PCNT02 520.1 ~ 520.2 TCU9 -
Honeywell C300 PCNT05 520.1 ~ 520.2 TCU9 -
Honeywell FIM4 520.1 ~ 520.2 TCU9 -
Honeywell FIM8 520.1 ~ 520.2 TCU9 -
Honeywell UOC 520.1 ~ 520.2 TCU9 -
Honeywell CN100 520.1 ~ 520.2 TCU9 -
Honeywell HCA 520.1 ~ 520.2 TCU9 -
Honeywell C300PM 520.1 ~ 520.2 TCU9 -
Honeywell C200E 520.1 ~ 520.2 TCU9 -

II. Public POCs for CVE-2025-3947

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III. Intelligence Information for CVE-2025-3947

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Vendor Pages for CVE-2025-3947 (1)

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

CVE-2025-2523 9.4 CRITICAL Lack of buffer clearing before reuse may result in incorrect system behavior.
CVE-2025-2521 8.6 HIGH Lack of indexes’ validation against buffer borders leads to remote code execution.
CVE-2025-3946 8.2 HIGH Incorrect response generation during FTEB protocol processing
CVE-2025-2520 7.5 HIGH Dereferencing of an uninitialized pointer leads to denial of service.
CVE-2025-2522 6.5 MEDIUM Lack of buffer clearing before reuse may result in incorrect system behavior.

IV. Related Vulnerabilities

Same product: C300 PCNT02
Same vendor: Honeywell
Same weakness: CWE-191

V. Comments for CVE-2025-3947

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