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NVD / CVE Program· CNA Honeywell

CVE-2023-5395: Server receiving a malformed message that uses the hostname in an internal table may cause a stack overflow resulting in possible remote cod

Noroxi assessment

Priority: Monitor (action score 32/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.74% (FIRST EPSS); higher than 55% of all records.
  • 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.
  • Fixed version: Honeywell Experion Server 510.2 HF14, 511.5 TCU4 HF4, 520.1 TCU5.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Honeywell Experion Server 510.2 HF14, 511.5 TCU4 HF4, 520.1 TCU5 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Server receiving a malformed message that uses the hostname in an internal table may cause a stack overflow resulting in possible remote code execution. See Honeywell Security Notification for recommendations on upgrading and versioning.

HighCVSS 8.1 · v3.1—No exploit Fix available
Published
Apr 17, 2024
Updated
Jun 17, 2026
EPSS
0.7% · 55th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Honeywell
8.1
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.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-5395

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
honeywellexperion server

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

Published before and after this one in the same product

  • ← EarlierCVE-2023-5393Apr 11, 2024 · Server receiving a malformed message that causes a disconnect to a hostname may causing a stack overflow resulting in possible remote code e
    29Monitor
  • ← EarlierCVE-2023-5394Apr 11, 2024 · Server receiving a malformed message that where the GCL message hostname may be too large which may cause a stack overflow; resulting in pos
    29Monitor
  • Later →CVE-2023-5396Apr 17, 2024 · Server receiving a malformed message creates connection for a hostname that may cause a stack overflow resulting in possible remote code exe
    29Monitor

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.

No history yet (it accumulates with the daily EPSS job).

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-2023-54010 days apartServer receiving a malformed message based on a using the specified key values can cause a stack overflow vulnerability which could lead to
    32Monitor
  • CVE-2023-54030 days apartServer hostname translation to IP address manipulation which could lead to an attacker performing remote code execution or causing a failure
    32Monitor

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-121 · Stack-based Buffer Overflow

CVSS vector

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