CVE-2023-5389Public exploitNetwork attack vector

Pre-auth code execution via arbitrary EpicMo file write

Published Jan 30, 2024 · Updated Jun 17, 2025

An exposed dangerous function in Honeywell ControlEdge UOC allows remote attackers to modify controller files through unauthenticated EpicMo requests. The EpicMo LoadFileToModule handler accepts an attacker-controlled destination path and data without validation or path limits. Access to the OT network is sufficient; overwriting a startup-loaded shared object and rebooting a Virtual UOC yields unauthorized code execution.

CVSS severity9.1
Critical
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

An exposed dangerous function in Honeywell ControlEdge UOC allows remote attackers to modify controller files through unauthenticated EpicMo requests. The EpicMo LoadFileToModule handler accepts an attacker-controlled destination path and data without validation or path limits. Access to the OT network is sufficient; overwriting a startup-loaded shared object and rebooting a Virtual UOC yields unauthorized code execution.

The record

CVE
CVE-2023-5389
Published
Jan 30, 2024
Updated
Jun 17, 2025
Vendor
Honeywell Technologies
Product
ControlEdge Unit Operations Controller
Classifications
CWE-749, CAPEC-126, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 30, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=510.1 <=510.2 HF13
  2. Affected versionversion=511.1 <=511.5 TCU4 HF3
  3. Affected versionversion=520.1 <=520.1 TCU4
  4. Affected versionversion=520.2 <=520.2 TCU4
  5. Affected versionversion=520.2 TCU4 HFR2 <=511.5 TCU4 HF3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Honeywell Technologies · ControlEdge Unit Operations Controllerversion=510.1 <=510.2 HF13; version=511.1 <=511.5 TCU4 HF3; version=520.1 <=520.1 TCU4; version=520.2 <=520.2 TCU4; version=520.2 TCU4 HFR2 <=511.5 TCU4 HF3

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
9.1Honeywell International Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-749Exposed Dangerous Method or Function
CAPEC-126Path Traversal
T1190Exploit Public-Facing Application

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo