CVE-2025-54851
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 · uneditedA denial of service vulnerability exists in the Modbus TCP and Modbus RTU over TCP functionality of Socomec DIRIS Digiware M-70 1.6.9. A specially crafted series of network requests can lead to a denial of service. An attacker can send a sequence of unauthenticated packets to trigger this vulnerability.An attacker can trigger this denial-of-service condition by sending a single Modbus TCP message to port 503 using the Write Single Register function code (6) to write the value 1 to register 4352. This action changes the Modbus address to 15. After this message is sent, the device will be in a denial-of-service state.
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 · high confidenceA denial of service vulnerability exists in Socomec DIRIS Digiware M-70 version 1.6.9's Modbus TCP functionality. An unauthenticated attacker can send a single Modbus TCP message to port 503 using function code 6 (Write Single Register) with value 1 to register 4352, which changes the Modbus address to 15 and renders the device unresponsive.
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= 1.6.9CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Confirm DIRIS Digiware M-70 modelAccess the device management interface or check the device nameplate/documentation to verify the model is DIRIS Digiware M-70. This vulnerability only affects this specific model.Affected if Model is not DIRIS Digiware M-70
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Identify firmware versionAccess the device web interface or use the vendor management tool to check the installed firmware version. Look for a version display in the system information or device status section.Affected if Firmware version is 1.6.9 exactly
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Verify Modbus TCP is enabledCheck the device network configuration to determine if Modbus TCP communication is enabled. This is typically found in the communication settings or network services configuration menu.Affected if Modbus TCP is enabled on the device
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Confirm port 503 is accessibleScan the device from the network to verify port 503 (Modbus TCP) is open and listening. Use a port scanner like nmap: nmap -p 503 <device-ip>Affected if Port 503 is open and responding to TCP connections
You are affected if you have a DIRIS Digiware M-70 with firmware version 1.6.9, Modbus TCP is enabled, and port 503 is accessible on the network.
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.
From vendor dataApply the vendor-supplied firmware patch to version 1.6.9 to remediate this vulnerability. Until patched, network segment the device and restrict access to Modbus port 503 to reduce attack surface.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-54851 — 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-2025-54851 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
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- Version or environment caveats, and links to real fixes
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