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Expresscluster XApplication · Nec

CVE-2023-39546

HIGH · 8.8 CVSS v3.1 Published 2023-11-17
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
94/100
Remediation priority · Urgent
Remotely reachable 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
CLUSTERPRO X Ver5.1 and earlier and EXPRESSCLUSTER X 5.1 and earlier, CLUSTERPRO X SingleServerSafe 5.1 and earlier, EXPRESSCLUSTER X SingleServerSafe 5.1 and earlier allows a attacker to log in to the product may execute an arbitrary command.

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

This is a command injection vulnerability in CLUSTERPRO X and EXPRESSCLUSTER X high-availability software versions 5.1 and earlier. An authenticated attacker who can log into the product can execute arbitrary commands on the underlying system, likely due to insufficient input validation in user-facing functionality.

MitigationUpgrade to versions newer than 5.1 for all affected CLUSTERPRO X and EXPRESSCLUSTER X products (including SingleServerSafe variants). If immediate patching is not possible, restrict network access to management interfaces and enforce strong authentication credentials.

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
Expresscluster XApplication
Affected:= 1.0= 2.0= 2.1= 3.0= 3.1= 3.2= 3.3= 4.0= 4.1= 4.2= 4.3= 5.0
Expresscluster X SingleserversafeApplication
Affected:= 1.0= 2.0= 2.1= 3.0= 3.1= 3.2= 3.3= 4.0= 4.1= 4.2= 4.3= 5.0

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 if Expresscluster or Clusterpro software is installed
    Check system for Expresscluster X, Clusterpro X, or SingleServerSafe installation directories or installed packages. Look for typical installation paths such as /opt/Expresscluster or check Windows Program Files for Clusterpro/Expresscluster folders.
    Affected if The software is present on the system
  2. Determine the installed version of Expresscluster X or Clusterpro X
    Locate version information in the installed product. Check the product's About dialog, installer logs, or version file within the installation directory. The version may be visible in the management console or returned by a product-specific command if available.
    Affected if The installed version is 5.1 or earlier (versions 1.0 through 5.1)
  3. Confirm the specific product variant
    Identify whether the installation is Nec Expresscluster X, Clusterpro X, or Nec Expresscluster X Singleserversafe. Check the product name shown in the management interface or installation metadata.
    Affected if The product is either Nec Expresscluster X or Nec Expresscluster X Singleserversafe with version 5.1 or earlier
  4. Check if the management web interface is accessible
    Determine if the Expresscluster/Clusterpro management interface (typically on ports 29001, 29002, or similar) is exposed on network interfaces. Attempt to access the web console or verify listening services on common management ports.
    Affected if The management interface is reachable from network locations where untrusted authenticated users could access it

A user is affected if Nec Expresscluster X, Clusterpro X, or SingleServerSafe version 5.1 or earlier is installed and the management interface is accessible to authenticated attackers.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade to versions newer than 5.1 for all affected CLUSTERPRO X and EXPRESSCLUSTER X products (including SingleServerSafe variants). If immediate patching is not possible, restrict network access to management interfaces and enforce strong authentication credentials.

Recommended fix Moderate confidence

EXPRESSCLUSTER X / CLUSTERPRO X version 5.2 or later

  1. 1. Identify the current installed version of EXPRESSCLUSTER X or EXPRESSCLUSTER X SingleServerSafe by checking the product documentation or system configuration.
  2. 2. Download the latest version of EXPRESSCLUSTER X from the official NEC website (jpn.nec.com) or the NEC Software Download portal.
  3. 3. Review the upgrade guide and release notes for EXPRESSCLUSTER X to understand the upgrade procedure specific to your deployment configuration.
  4. 4. Create a complete backup of the current cluster configuration, including all configuration files and databases.
  5. 5. Follow the NEC-approved upgrade procedure to update to version 5.2 or later, which contains the security fix for CVE-2023-39546.
  6. 6. After upgrading, verify that the cluster services start correctly and all nodes are communicating properly.
  7. 7. Validate that the arbitrary command execution vulnerability is remediated by confirming the password hashing mechanism has been strengthened.
Caveat Review release notes for potential breaking changes between version 5.1 and 5.2, including any database migration requirements or configuration file updates

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

Fix this in Expresscluster X Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing6.0 h
  • Review / QA3.0 h
15.0 hours of engineering $2,560
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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-2023-39546 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