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CVE-2025-3947

Integer underflow during processing of short network packets in CDA FTEB responder

High8.2EPSS 0.37%
Published
Updated
Reserved
Assigned by
Honeywell

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.

Scores

CVSS scores of CVE-2025-3947, by who scored it
Scored byCVSSScoreVector
HoneywellCNA (assigner)3.1High8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
NVDNVD · Deferred3.1High8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
EPSS (exploitation in 30 days)
0.37% · top 69% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.

Weakness

Affected products

  • Honeywell · C300 PCNT02

    • affected 520.1 – ≤ 520.2 TCU9
    • affected 530 – ≤ 530 TCU3

  • Honeywell · C300 PCNT05

    • affected 520.1 – ≤ 520.2 TCU9
    • affected 530 – ≤ 530 TCU3

  • Honeywell · FIM4

    • affected 520.1 – ≤ 520.2 TCU9
    • affected 530 – ≤ 530 TCU3

  • Honeywell · FIM8

    • affected 520.1 – ≤ 520.2 TCU9
    • affected 530 – ≤ 530 TCU3

  • Honeywell · UOC

    • affected 520.1 – ≤ 520.2 TCU9
    • affected 530 – ≤ 530 TCU3

  • Honeywell · CN100

    • affected 520.1 – ≤ 520.2 TCU9
    • affected 530 – ≤ 530 TCU3

  • Honeywell · HCA

    • affected 520.1 – ≤ 520.2 TCU9
    • affected 530 – ≤ 530 TCU3

  • Honeywell · C300PM

    • affected 520.1 – ≤ 520.2 TCU9
    • affected 530 – ≤ 530 TCU3

  • Honeywell · C200E

    • affected 520.1 – ≤ 520.2 TCU9
    • affected 530 – ≤ 530 TCU3

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .