CVE-2026-66281 PUBLISHED

Authenticated Denial-of-Service in Zigbee Discover Attributes Handling

Assigner: Silabs
Reserved: 24.07.2026 Published: 22.10.2026 Updated: 22.10.2026

In EmberZNet 9.1.1 and earlier, a malformed Discover Attributes command can result in a loop with unreachable exit condition (infinite loop). These messages must come from a device that has already joined the network. Only devices supporting manufacturer-specific clusters are impacted.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 6

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	Silicon Labs
Product	EmberZNet
Versions	Default: unaffected affected from 0 to 9.1.1 (incl.)

Credits

Junming C. (@Chapoly1305) and Prof. Qiang Zeng of George Mason University reporter

References

https://github.com/SiliconLabsSoftware/docs-security-advisories/blob/main/Advisories/500-599/A-00000590.md

Problem Types

CWE-835 Loop with unreachable exit condition ('infinite loop') CWE

Impacts

CAPEC-153 Input Data Manipulation