CVE-2023-25178Network attack vector

Remote code execution via unsigned firmware loading

Published Jul 13, 2023 · Updated Mar 5, 2025

Insufficient firmware authenticity verification in Honeywell Experion PKS C300 Controller allows remote attackers to execute code. The controller's firmware-loading path accepts malicious firmware without verifying its cryptographic authenticity before installation. Unauthenticated network delivery of a firmware image enables attacker-controlled code to run with the controller's authority, affecting process confidentiality, integrity, and availability.

CVSS severity9.8
Critical
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient firmware authenticity verification in Honeywell Experion PKS C300 Controller allows remote attackers to execute code. The controller's firmware-loading path accepts malicious firmware without verifying its cryptographic authenticity before installation. Unauthenticated network delivery of a firmware image enables attacker-controlled code to run with the controller's authority, affecting process confidentiality, integrity, and availability.

The record

CVE
CVE-2023-25178
Published
Jul 13, 2023
Updated
Mar 5, 2025
Vendor
Honeywell Technologies
Product
Experion PKS C300 Controller
Classifications
CWE-345, CAPEC-638, T1693.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=501.1 <=501.6HF8
  2. Affected versionversion=510.1 <=510.2HF12
  3. Affected versionversion=510.1 <=511.5TCU3
  4. Affected versionversion=511.1 <=511.5TCU3
  5. Affected versionversion=520.1 <=520.1TCU4
  6. Affected versionversion=520.2 <=520.2TCU2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Honeywell Technologies · Experion PKS C300 Controllerversion=501.1 <=501.6HF8; version=510.1 <=510.2HF12; version=510.1 <=511.5TCU3; version=511.1 <=511.5TCU3; version=520.1 <=520.1TCU4; version=520.2 <=520.2TCU2

Published CVSS scores

9.8HoneywellCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CAPEC-638Altered Component Firmware
T1693.001Modify Firmware: System Firmware

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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