CVE-2023-5398Network attack vector

Service interruption via malformed IP-list message

Published Apr 17, 2024 · Updated Aug 2, 2024

Heap corruption in Honeywell Experion Server allows remote attackers to interrupt service by sending a malformed IP-list message. Honeywell states that processing a malformed list of IP addresses corrupts heap memory, but does not identify the affected function or memory operation. The network path requires no credentials or user interaction, but exploitation has high complexity and the documented consequence is limited to service interruption.

CVSS severity5.9
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap corruption in Honeywell Experion Server allows remote attackers to interrupt service by sending a malformed IP-list message. Honeywell states that processing a malformed list of IP addresses corrupts heap memory, but does not identify the affected function or memory operation. The network path requires no credentials or user interaction, but exploitation has high complexity and the documented consequence is limited to service interruption.

The record

CVE
CVE-2023-5398
Published
Apr 17, 2024
Updated
Aug 2, 2024
Vendor
Honeywell Technologies
Product
Experion Server
Classifications
CWE-1327, CAPEC-1, T1499.004
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
  2. Affected versionversion=510.1 <=510.2 HF13
  3. Affected versionversion=511.1 <=511.5_tcu4_hf3
  4. Affected versionversion=511.1 <=511.5 TCU4 HF3
  5. Affected versionversion=520.1 <=520.1_tcu4
  6. Affected versionversion=520.1 <=520.1 TCU4
  7. Affected versionversion=520.2 <=520.2_tcu4
  8. Affected versionversion=520.2 <=520.2 TCU4
  9. Affected versionversion=520.2 TCU4 HFR2 <=511.5 TCU4 HF3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Honeywell Technologies · Experion Serverversion=510.1 <=510.2_hf13; version=510.1 <=510.2 HF13; version=511.1 <=511.5_tcu4_hf3; version=511.1 <=511.5 TCU4 HF3; version=520.1 <=520.1_tcu4; version=520.1 <=520.1 TCU4; version=520.2 <=520.2_tcu4; version=520.2 <=520.2 TCU4; version=520.2 TCU4 HFR2 <=511.5 TCU4 HF3

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-1327Binding to an Unrestricted IP Address
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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