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CVE-2023-5406· NVD / CVE Program· CNA Honeywell

Server communication with a controller can lead to remote code execution using a specially crafted message from the controller.

Server communication with a controller can lead to remote code execution using a specially crafted message from the controller. See Honeywell Security Notification for recommendations on upgrading and versioning.

MediumCVSS 5.9 · v3.1—No exploit Fix available

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Published
Apr 17, 2024
Updated
Jun 17, 2026
EPSS
0.7% · 51th percentile
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Report tools

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Action score

23

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Honeywell
5.9
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Honeywell). Independent of NVD's CPE analysis and usually ahead of it.

  • Honeywell Experion Server

    • 520.2 and later · up to and including 520.2 TCU4affected · semverfixed in 520.2 TCU4 HF1
    • 510.1 and later · up to and including 510.2 HF13affected · semverfixed in 510.2 HF14
    • 520.1 and later · up to and including 520.1 TCU4affected · semverfixed in 520.1 TCU5
    • 511.1 and later · up to and including 511.5 TCU4 HF3affected · semverfixed in 511.5 TCU4 HF4
    • 520.2 and later · up to and including 520.2 TCU4affected · semverfixed in 520.2 TCU4 HF2
    • 511.1 and later · up to and including 511.5 TCU4 HF3affected · semverfixed in 511.5 TCU4 HF4
    • 520.1 and later · up to and including 520.1 TCU4affected · semverfixed in 520.1 TCU5
    • 520.2 and later · up to and including 520.2 TCU4affected · semverfixed in 520.2 TCU4 HF2
    • 520.1 and later · up to and including 520.1 TCU4affected · semverfixed in 520.1 TCU5
    • 520.2 TCU4 HFR2 and later · up to and including 511.5 TCU4 HF3affected · semverfixed in 511.5 TCU4 HF4

Same product

honeywell: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-5404Server receiving a malformed message can cause a pointer to be overwritten which can result in a remote code execution or failure.
    32Monitor
  • CVE-2023-5403Server hostname translation to IP address manipulation which could lead to an attacker performing remote code execution or causing a failure
    32Monitor
  • CVE-2023-5401Server receiving a malformed message based on a using the specified key values can cause a stack overflow vulnerability which could lead to
    32Monitor
  • CVE-2023-5400Server receiving a malformed message based on a using the specified key values can cause a heap overflow vulnerability which could lead to a
    32Monitor
  • CVE-2023-5397Server receiving a malformed message to create a new connection could lead to an attacker performing remote code execution or causing a fail
    32Monitor
  • CVE-2023-5395Server receiving a malformed message that uses the hostname in an internal table may cause a stack overflow resulting in possible remote cod
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Honeywell Experion Server510.2 HF14Vendor (CNA)
Honeywell Experion Server511.5 TCU4 HF4Vendor (CNA)
Honeywell Experion Server520.1 TCU5Vendor (CNA)
Honeywell Experion Server520.2 TCU4 HF1Vendor (CNA)
Honeywell Experion Server520.2 TCU4 HF2Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2023-23585279 days apartServer DoS due to heap overflow
    30Monitor
  • CVE-2023-25078279 days apartDoS due to heap overflow
    30Monitor
  • CVE-2023-54050 days apartServer information leak for the CDA Server process memory can occur when an error is generated in response to a specially crafted message.
    23Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records