CVE-2023-5406Network attack vector

Service interruption via controller-message out-of-bounds write

Published Apr 17, 2024 · Updated Aug 2, 2024

Out-of-bounds write in Honeywell Technologies Experion Server allows remote attackers to interrupt service via a crafted controller message. The server controller-communication path writes beyond a buffer while processing the crafted message; Honeywell has not disclosed the affected function or field. The message must originate from a controller and exploitation has high complexity; Honeywell labels the result remote code execution, while its published assessment records availability impact only.

CVSS severity5.9
Medium
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Honeywell Technologies Experion Server allows remote attackers to interrupt service via a crafted controller message. The server controller-communication path writes beyond a buffer while processing the crafted message; Honeywell has not disclosed the affected function or field. The message must originate from a controller and exploitation has high complexity; Honeywell labels the result remote code execution, while its published assessment records availability impact only.

The record

CVE
CVE-2023-5406
Published
Apr 17, 2024
Updated
Aug 2, 2024
Vendor
Honeywell Technologies
Product
Experion Server
Classifications
CWE-787, CAPEC-100, T0866
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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 changes=[{"at":"510.2 HF14","status":"unaffected"}]
  2. Affected versionversion=511.1 <=511.5 TCU4 HF3 changes=[{"at":"511.5 TCU4 HF4","status":"unaffected"}]
  3. Affected versionversion=520.1 <=520.1 TCU4 changes=[{"at":"520.1 TCU5","status":"unaffected"}]
  4. Affected versionversion=520.2 <=520.2 TCU4 changes=[{"at":"520.2 TCU4 HF1","status":"unaffected"}]
  5. Affected versionversion=520.2 <=520.2 TCU4 changes=[{"at":"520.2 TCU4 HF2","status":"unaffected"}]
  6. Affected versionversion=520.2 TCU4 HFR2 <=511.5 TCU4 HF3 changes=[{"at":"511.5 TCU4 HF4","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Honeywell Technologies · Experion Serverversion=510.1 <=510.2 HF13 changes=[{"at":"510.2 HF14","status":"unaffected"}]; version=511.1 <=511.5 TCU4 HF3 changes=[{"at":"511.5 TCU4 HF4","status":"unaffected"}]; version=520.1 <=520.1 TCU4 changes=[{"at":"520.1 TCU5","status":"unaffected"}]; version=520.2 <=520.2 TCU4 changes=[{"at":"520.2 TCU4 HF1","status":"unaffected"}]; version=520.2 <=520.2 TCU4 changes=[{"at":"520.2 TCU4 HF2","status":"unaffected"}]; version=520.2 TCU4 HFR2 <=511.5 TCU4 HF3 changes=[{"at":"511.5 TCU4 HF4","status":"unaffected"}]

Published CVSS scores

5.9Honeywell International Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CAPEC-100Overflow Buffers
T0866Exploitation of Remote Services

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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