CVE-2023-40158
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 · uneditedHidden functionality vulnerability in the CBC products allows a remote authenticated attacker to execute an arbitrary OS command on the device or alter its settings. As for the affected products/versions, see the detailed information provided by the vendor. Note that NR4H, NR8H, NR16H series and DR-16F, DR-8F, DR-4F, DR-16H, DR-8H, DR-4H, DR-4M41 series are no longer supported, therefore updates for those products are not provided.
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 confidenceHidden functionality in CBC NR and DR series devices allows an authenticated remote attacker to execute arbitrary OS commands or modify device settings. This appears to be a command injection vulnerability via undocumented or hidden administrative functions in the firmware.
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 dataall versionsall versionsall versionsall versionsall versionsall versionsall versionsall versionsCVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify device modelLog into the device web interface or check the device label/menu to confirm the exact model (NR4H, NR8H, NR16H, DR16f42a, DR16f45at, DR8f42a, DR8f45at, or DR4fx1)Affected if Device model matches any of the listed affected products
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Check firmware versionAccess the device admin panel and navigate to System Information or About page to retrieve the firmware versionAffected if Any firmware version is installed (all versions are affected)
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Verify web admin interface exposureDetermine if the device web interface is accessible from outside the local network by checking router port forwarding rules, firewall policies, or by attempting remote accessAffected if The admin web interface is exposed to untrusted networks or the internet
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Inspect for undocumented endpointsReview the device web interface for hidden or undocumented menu items, URLs, or API endpoints not described in official documentationAffected if Undocumented administrative functions or endpoints are present
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Review authentication configurationCheck if default credentials are in use or if weak authentication is configured on the device admin panelAffected if Default credentials remain unchanged or authentication is weak
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Audit network connectivityUse network scanning to identify if the device management port (typically HTTP/HTTPS) is listening on externally accessible IP addressesAffected if Device management ports are reachable from untrusted networks
If the device is any model in the NR or DR series and its admin interface is network-accessible, the environment is affected by this vulnerability.
Generated from the published advisory. Verify against your own configuration.
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 · scopedApply vendor-provided firmware updates for supported product versions; for EOL series (NR4H/NR8H/NR16H and DR-xF/DR-xH/DR-4M41), implement network segmentation and consider device replacement since no patches will be released.
- Acknowledge that these products (NR4H, NR8H, NR16H, DR-16F, DR-8F, DR-4F, DR-16H, DR-8H, DR-4H, DR-4M41 series) are end-of-life and no longer supported by the vendor per the official description
- Implement network segmentation to isolate affected devices on separate VLANs with strict firewall rules
- Restrict access to management interfaces to authorized IP addresses only via ACLs
- Enable detailed audit logging and monitor for suspicious command execution or configuration changes
- Consider replacing affected devices with currently supported alternatives from Ganz or another vendor
- If continued operation is mandatory, implement additional compensating controls such as IDS/IPS monitoring for the device segment
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation8.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-40158 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2023-40158 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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