CVE-2025-56362 matter vulnerability
A reachable assertion vulnerability exists in the Matter SDK (connectedhomeip) before 1.4.2, specifically within the Level Control cluster's periodic server tick logic. When a MoveToLevel command is sent and immediately followed by a write of OperationMode=2 (in the Pump Configuration and Control cluster), the server tick function violates the assertion `currentLevel < maxLevel`, resulting in a crash. This can be exploited remotely without authentication to cause denial of service. Affected versions include 1.3 and 1.4 (commit ab3d5ae).
Quick answer
csa-iot matter should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- 1.3.0.0
- 1.4.0.0
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2025-56362 affects csa-iot matter and is rated high. A reachable assertion vulnerability exists in the Matter SDK (connectedhomeip) before 1.4.2, specifically within the Level Control cluster's periodic server tick logic. Fix this first on exposed systems, shared services, and user-facing workflows. The practical fix is to upgrade Matter SDK connectedhomeip to 1.4.2 or a later vendor-supported release, then verify the risky path is closed.
- Inventory every server, app, package, desktop, device, container, or workflow that uses csa-iot matter.
- Check the installed version and configuration against CVE-2025-56362 and the linked advisory.
- Apply the vendor fix: upgrade Matter SDK connectedhomeip to 1.4.2 or a later vendor-supported release.
- Limit untrusted Matter device traffic and test command handling in a safe lab before restoring exposure.
- Disable or isolate the affected feature if you cannot update right away.
- Review device crash logs, restart spikes, and unusual Matter command traffic.
- Rotate secrets, rebuild affected systems, or reset sessions if you suspect compromise.
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Verify the fix
- Confirm csa-iot matter is running the patched version or the approved mitigation is active.
- Confirm affected public, admin, API, desktop, storage, or device access is limited to trusted users.
- Repeat a safe test of the risky workflow and confirm the issue no longer appears.
- Review logs after the fix for crashes, bypass attempts, file access, or suspicious changes.
- Save version, config, log, and scan evidence for your remediation record.
Related categories
Trusted references
FAQ
What is affected by CVE-2025-56362?
csa-iot matter versions listed as affected should be reviewed: 1.3.0.0, 1.4.0.0.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.