CVE-2023-26597Network attack vector

Controller crash via unbounded CDA error response

Published Jul 13, 2023 · Updated Mar 5, 2025

A buffer overflow in Honeywell Experion PKS C300 Controller firmware allows remote attackers to crash the controller via a crafted CDA message. The SendErrorResponse routine reuses invalid request metadata while copying request data to a stack buffer and fails to bound eight-byte response entries. Unauthenticated controller-network access is sufficient; excess request parts overflow the response buffer and interrupt control service.

CVSS severity7.5
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A buffer overflow in Honeywell Experion PKS C300 Controller firmware allows remote attackers to crash the controller via a crafted CDA message. The SendErrorResponse routine reuses invalid request metadata while copying request data to a stack buffer and fails to bound eight-byte response entries. Unauthenticated controller-network access is sufficient; excess request parts overflow the response buffer and interrupt control service.

The record

CVE
CVE-2023-26597
Published
Jul 13, 2023
Updated
Mar 5, 2025
Vendor
Honeywell Technologies
Product
Experion PKS C300 Controller
Classifications
CWE-400, CWE-787, CAPEC-469, T0814
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

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=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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5Honeywell PSIRTCVSS:3.1/AV:N/AC:L/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-400Uncontrolled Resource Consumption
CWE-787Out-of-bounds Write
CAPEC-469HTTP DoS
T0814Denial of Service

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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