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Experion ServerApplication · Honeywell

CVE-2023-22435

HIGH · 7.5 CVSS v3.1 Published 2023-07-13
Fix available
A fix is available. Upgrade to after 520.2tcu2 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Experion server may experience a DoS due to a stack overflow when handling a specially crafted message.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A stack overflow vulnerability in Honeywell Experion server's message handling routine allows remote attackers to cause a denial of service by sending specially crafted messages. The stack overflow corrupts memory, potentially causing the server to crash or become unresponsive.

MitigationApply the vendor-provided security patch for CVE-2023-22435. Until the patch is available, consider network segmentation to limit exposure of the Experion server and implement input validation at perimeter controls.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Experion ServerApplication
Affected:>= 501.1, <= 501.6hf8>= 510.1, <= 510.2hf12>= 511.1, <= 511.5tcu3>= 520.1, <= 520.1tcu4>= 520.2, <= 520.2tcu2
Experion StationApplication
Affected:>= 501.1, <= 501.6hf8>= 510.1, <= 510.2hf12>= 511.1, <= 511.5tcu3>= 520.1, <= 520.1tcu4>= 520.2, <= 520.2tcu2
Engineering StationApplication
Affected:>= 510.1, <= 511.5tcu3>= 520.1, <= 520.1tcu4>= 520.2, <= 520.2tcu2
Direct StationApplication
Affected:>= 510.1, <= 511.5tcu3>= 520.1, <= 520.1tcu4>= 520.2, <= 520.2tcu2

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed Honeywell Experion product
    Locate Honeywell Experion Server, Experion Station, Engineering Station, or Direct Station installations on the system. Check program directories, installed software lists, or system inventory for these product names.
    Affected if Any of these Honeywell Experion products are installed on the system
  2. Determine the installed version
    Use system inventory tools, software management consoles, or check version information within the Honeywell Experion application itself to identify the exact version number (e.g., 501.1, 510.2hf12, 520.1tcu4).
    Affected if The installed version falls within any of these ranges: 501.1 to 501.6hf8, 510.1 to 510.2hf12, 511.1 to 511.5tcu3, 520.1 to 520.1tcu4, or 520.2 to 520.2tcu2
  3. Verify the message handling service is exposed
    Check if the Experion server service is running and accessible on the network. Review network configuration to determine if the message handling interface is exposed to network traffic.
    Affected if The Experion server or station service is running and accessible on the network, particularly on ports used for client-server communication
  4. Review system logs for crashes or anomalies
    Examine system event logs, Experion application logs, and any available crash dumps for evidence of unexpected restarts, memory corruption errors, or stack overflow indicators related to message processing.
    Affected if Logs show unexplained crashes, service restarts, or error messages indicating memory corruption or stack overflow in message handling routines

If any Honeywell Experion product is installed and its version falls within the affected ranges listed, the environment is potentially vulnerable to CVE-2023-22435.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 520.2tcu2
Interim mitigation

Apply the vendor-provided security patch for CVE-2023-22435. Until the patch is available, consider network segmentation to limit exposure of the Experion server and implement input validation at perimeter controls.

Recommended fix Moderate confidence

Contact Honeywell for the latest fixed release beyond affected version ranges (e.g., 501.6hf9+, 510.2hf13+, 511.5tcu4+, 520.1tcu5+, 520.2tcu3+)

  1. Contact Honeywell technical support (process.honeywell.com) to obtain the latest security patch for your Experion product line
  2. Request the specific fixed release version that addresses CVE-2023-22435
  3. Plan maintenance window for patch deployment as this is a server-side fix
  4. Apply the patch to all affected Experion Server, Experion Station, Engineering Station, and Direct Station installations
  5. Verify the patch was applied successfully and the service restarts without errors
  6. Confirm the vulnerability is remediated through internal testing or Honeywell validation
Caveat Industrial control system upgrades may require compatibility testing with existing controllers and integrated systems; coordinate with operations team

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Experion Server Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing8.0 h
  • Review / QA4.0 h
24.0 hours of engineering $4,160
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-22435 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data