EUVD-2026-39404
GHSA-4g44-cv7p-fgrg
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
Reachable over the network but only from an already-joined device (PR:L), low complexity (AC:L), and impact is solely a process crash (A:H) with no confidentiality or integrity effect.
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, malformed or out-of-range Door Lock user identifiers can trigger out-of-bounds table reads and terminate the process. These messages must come from a device that has already joined the network, and no information leakage back to the sender was observed. Only devices supporting the Door Lock cluster may be impacted.
AnalysisAI
Denial of service in Silicon Labs EmberZNet Zigbee stack (v9.0.2 and earlier) lets an already-joined network device crash the target by sending Door Lock cluster messages containing malformed or out-of-range user identifiers, which trigger an out-of-bounds table read (CWE-125) that terminates the process. Only devices that implement the Door Lock cluster are affected, and no data is leaked back to the sender. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to control a device that has ALREADY joined the target Zigbee network (the messages 'must come from a device that has already joined the network'), so prior network membership/authentication is a hard prerequisite - this is reflected in PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N) with impact limited to VA:H (availability only; VC:N/VI:N/VA:H) scores 7.1 and accurately reflects a network-reachable but membership-gated denial of service with no confidentiality or integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has compromised or spoofed a device already joined to the Zigbee network sends a crafted Door Lock command containing an out-of-range user identifier to a target device that supports the Door Lock cluster. The malformed identifier causes an out-of-bounds table read in EmberZNet that terminates the stack process, knocking the lock/controller offline (a crash/DoS). … |
| Remediation | Upgrade the EmberZNet stack to the vendor-patched release: a patch is available from Silicon Labs (Patch available per vendor advisory; the exact fixed version is not enumerated in the provided data, so confirm the target version against the advisory at https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/069Vm00000pEGPQIA4?operationContext=S1 and the patched sources at https://github.com/SiliconLabsSoftware/sisdk-release/, then rebuild and reflash affected device firmware). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Identify all systems and devices using Silicon Labs EmberZNet Zigbee with Door Lock cluster implementation. …
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Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Silicon Labs Ember ZNet allows
A malformed packet causes a stack overflow in the Ember ZNet stack. Rated high severity (CVSS 7.5), this vulnerability i
Remote denial of service in Silicon Labs EmberZNet Zigbee stack (v9.0.2 and earlier) lets an already-joined network devi
Denial of service in Silicon Labs EmberZNet Zigbee stack (v9.0.2 and earlier) allows a device already joined to the Zigb
Denial of service in Silicon Labs EmberZNet (Zigbee stack) v9.0.2 and earlier allows an already-joined network device to
Out-of-bounds memory writes in Silicon Labs EmberZNet (Zigbee stack) v9.0.2 and earlier allow an already-joined network
Denial of service in Silicon Labs EmberZNet (Zigbee stack) versions 9.0.2 and earlier allows an already-joined network d
Denial of service in Silicon Labs EmberZNet Zigbee stack (v9.0.2 and earlier) allows an already-joined network device to
Out-of-bounds read in the Silicon Labs EmberZNet Zigbee stack (v9.0.2 and earlier) lets an already-joined network device
Denial of service in Silicon Labs EmberZNet Zigbee stack (v9.0.2 and earlier) lets an already-joined network device cras
Denial of service in Silicon Labs EmberZNet Zigbee stack (v9.0.2 and earlier) allows an already-joined network device to
Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today