CVE-2025-56365 matter vulnerability
A reachable assertion vulnerability exists in the Matter SDK (connectedhomeip) before 1.4.0, in the interaction model command processing logic. When an InvokeCommandRequest is sent to a nonexistent endpoint and cluster (e.g., 0x34), the code incorrectly treats the endpoint as valid due to missing checks in CodegenDataModelProvider::Invoke. This causes a VerifyOrDie failure in ProcessCommandDataIB and results in a crash (SIGABRT). The issue has been acknowledged and fixed in a later revision (PR #37207).
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
- Review vendor advisory for affected versions.
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2025-56365 affects csa-iot matter and is rated high. A reachable assertion vulnerability exists in the Matter SDK (connectedhomeip) before 1.4.0, in the interaction model command processing logic. Fix this first on internet-facing or admin systems. The practical fix is to upgrade Matter SDK connectedhomeip to 1.4.0 or a later revision that includes the command handling fix, then verify the system is no longer exposed.
- Inventory every server, container, appliance, cluster, plugin, or device that uses csa-iot matter.
- Check the installed version and configuration against CVE-2025-56365 and the linked advisory.
- Apply the vendor fix: upgrade Matter SDK connectedhomeip to 1.4.0 or a later revision that includes the command handling fix.
- Limit untrusted device traffic and test Matter command handling after the SDK update.
- Disable or isolate the affected feature if you cannot update right away.
- Review crash logs, restarts, and error spikes that match the vulnerable component.
- 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, tunnel, or cluster access is limited to trusted users.
- Repeat the risky workflow or a safe test case and confirm the issue no longer appears.
- Review logs again after the fix for crashes, bypass attempts, file access, or suspicious changes.
- Save version, config, log, and scan evidence for your remediation record.
Trusted references
FAQ
What is affected by CVE-2025-56365?
csa-iot matter should be checked against the vendor advisory and trusted references linked on this page.
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.