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Classic Buffer OverflowWeakness · CWE-120

CVE-2025-12012

CRITICAL · 9.2 CVSS v4.0 Published 2026-07-14
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click 5 weeks old

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
A denial-of-service issue exists in 5380/5480/5580 controllers. This vulnerability could potentially allow a malicious user to write invalid file data to the controller, causing the device to enter a major non-recoverable fault (MNRF).

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

A denial-of-service vulnerability in 5380/5480/5580 controllers allows a malicious user to write invalid file data, triggering a major non-recoverable fault (MNRF) that renders the device unavailable. The CVSS 9.2 indicates easily exploitable network-level attack with complete loss of availability.

MitigationRestrict network access to controllers via firewall rules/segmentation, implement strong authentication for management interfaces, and apply vendor firmware updates when available. Monitor for anomalous file write operations.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

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
None
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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. Confirm controller model
    Use CLI command 'show version' or management interface to identify the exact controller model number
    Affected if Model is 5380, 5480, or 5580 controller series
  2. Check firmware version
    Execute 'show version' or 'show firmware' command to retrieve the installed firmware version. Compare against vendor release notes if fixed version is known
    Affected if Firmware version is older than the patched version or unknown
  3. Verify device fault state
    Run 'show fault' or 'show system health' command to check if the device is currently in a Major Non-Recoverable Fault (MNRF) state
    Affected if Device displays MNRF or major fault status indicating potential exploitation
  4. Audit authentication logs
    Review authentication and operation logs for suspicious authenticated sessions, especially file write operations
    Affected if Anomalous authenticated activity or unauthorized file operations are logged
  5. Inspect file write configuration
    Use 'show running-config' or management interface to examine file write permissions and related settings
    Affected if File write functionality is accessible to authenticated users without additional restrictions

User is affected if they operate a 5380/5480/5580 controller with firmware lacking the security patch and with file write access available to authenticated users

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Restrict network access to controllers via firewall rules/segmentation, implement strong authentication for management interfaces, and apply vendor firmware updates when available. Monitor for anomalous file write operations.

Have this fixed Scoped from the published advisory
  • Consultation8.0 h
  • Implementation16.0 h
  • Testing8.0 h
  • Review / QA4.0 h
36.0 hours of engineering $6,400
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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-2025-12012 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