# CVE-2026-47147: Silicon Labs EmberZNet out-of-bounds read in OTA server parser

Source: https://junglewise.ai/threats/cve-2026-47147-silicon-labs-emberznet-out-of-bounds-read-in-ota-server-parser  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-25. Updated: 2026-06-25  
License: CC BY 4.0 with a link back

CVE-2026-47147 · Severity: info · CVSS 7.1 · Published 2026-06-25

Silicon Labs EmberZNet, a software stack used for Zigbee networking in smart home and industrial IoT devices, contains a vulnerability in its Over-the-Air (OTA) update component. An attacker with access to the local wireless network can send specially crafted update requests to trigger a memory error. This can lead to the exposure of small amounts of internal device memory or cause the device to become unresponsive, potentially disrupting smart home operations or industrial monitoring.

Technologies: [Silicon Labs EmberZNet](https://junglewise.ai/threats/technologies/emberznet). Vendors: [Silicon Labs](https://junglewise.ai/threats/vendors/silicon-labs).

## Quick answers

**Is CVE-2026-47147 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-47147 being exploited in the wild.

**How severe is CVE-2026-47147?** Informational severity, with a CVSS score of 7.1, published 25 June 2026.

**Which products and versions are affected?** Silicon Labs EmberZNet 0 to 9.0.2.

**Is there a fix for CVE-2026-47147?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-47147 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-47147?** Check whether you run Silicon Labs EmberZNet at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An out-of-bounds read vulnerability (CWE-125) exists in the OTA server parser of Silicon Labs EmberZNet versions 9.0.2 and earlier. The flaw is triggered when the OTA server processes malformed OTA requests. An attacker who has already joined the Zigbee network can exploit this to read a limited amount of data from RAM or potentially cause a crash (denial of service). The impact is restricted to devices supporting the OTA Server cluster, and the location/size of the leaked data is constrained by the parser logic. Users are advised to update to a version beyond 9.0.2.

## Affected products

- Silicon Labs EmberZNet 0 to 9.0.2

## Timeline

- 2026-06-25: disclosed
- 2026-06-25: advisory

## References

- [https://github.com/SiliconLabsSoftware/sisdk-release/](https://github.com/SiliconLabsSoftware/sisdk-release/)
- [https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/069Vm00000pEGPQIA4?operationContext=S1](https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/069Vm00000pEGPQIA4?operationContext=S1)

## Related threats

- [Silicon Labs EmberZNet out-of-bounds write in Price cluster](https://junglewise.ai/threats/cve-2026-94502-in-emberznet-9-1-1-and-earlier-a-malformed-publish-price-matrix)
- [Silicon Labs EmberZNet out-of-bounds write in Group Cluster](https://junglewise.ai/threats/cve-2026-85080-in-emberznet-9-1-1-and-earlier-a-malformed-getgroupmembership)
- [Silicon Labs EmberZNet out-of-bounds write in Simple_Desc_req](https://junglewise.ai/threats/cve-2026-85079-in-emberznet-9-1-1-and-earlier-a-malformed-simple-desc-req)
- [Silicon Labs EmberZNet denial-of-service in Price Cluster](https://junglewise.ai/threats/cve-2026-66282-in-emberznet-9-1-1-and-earlier-a-malformed-publish-billing-period)
- [Silicon Labs EmberZNet denial-of-service in Discover Attributes](https://junglewise.ai/threats/cve-2026-66281-in-emberznet-9-1-1-and-earlier-a-malformed-discover-attributes)