EUVD-2026-39407
GHSA-33vq-frr6-w8mj
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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
Zigbee is a local radio mesh so AV:A is more accurate than AV:N; attacker must be a joined network member (PR:L), and impact is availability-only crash (A:H, C/I:N).
Primary rating from Vendor (Silabs).
CVSS VectorVendor: Silabs
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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
Lifecycle Timeline
1DescriptionCVE.org
In EmberZNet v9.0.2 and earlier, a malformed Level Control Move command can terminate the process through a divide-by-zero fault. This command must come from a device that has already joined the network. Only devices supporting the Level Control cluster may be impacted.
AnalysisAI
Denial of service in Silicon Labs EmberZNet (Zigbee stack) v9.0.2 and earlier allows an already-joined network device to crash the host process via a malformed Level Control 'Move' command that triggers a divide-by-zero fault. Only deployments where the target device supports the Level Control cluster are affected, and exploitation requires the attacker to be an authenticated member of the Zigbee network (PR:L). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker's device to have already joined the target Zigbee network (PR:L - authenticated network membership), and the target device must support the Zigbee Level Control cluster; devices without that cluster cannot be impacted. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are consistent and point to a moderate, availability-only risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has gained membership in the Zigbee network - for example by compromising a low-security joined node or abusing an open permit-join window - sends a single malformed Level Control 'Move' command to a device that supports the Level Control cluster. The crafted command triggers a divide-by-zero fault that terminates the target's process, knocking the device offline. … |
| Remediation | Patch available per vendor advisory: upgrade EmberZNet beyond 9.0.2 to the fixed release distributed through the Silicon Labs SiSDK (https://github.com/SiliconLabsSoftware/sisdk-release/) and follow the advisory at https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/069Vm00000pEGPQIA4; the input does not state an exact fixed version number, so confirm the target build with Silicon Labs before flashing. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all EmberZNet deployments and identify systems running v9.0.2 or earlier with Level Control cluster enabled. …
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Same weakness CWE-369 – Divide By Zero
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External POC / Exploit Code
Leaving vuln.today