CVE-2026-6924 PUBLISHED

Weak entropy initialization in Silicon Labs Matter SiWx917 TinyCrypt path

Assigner: Silabs
Reserved: 23.04.2026 Published: 23.07.2026 Updated: 24.07.2026

A bug in the entropy initialization for SiWx917 causes the DRBG to use a predictable seed. As such, all random numbers generated in the Matter code use the same stream of numbers. This vulnerability was discovered after the impacted repository was already deprecated.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS Score: 8.7

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

CVSS 4.0

Product Status

Vendor	Silicon Labs
Product	Silicon Labs Matter Github
Versions	Default: unaffected Version 0 is affected

Credits

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

CVE-2026-6924 PUBLISHED

Weak entropy initialization in Silicon Labs Matter SiWx917 TinyCrypt path

Metrics

Product Status

Credits

References

Problem Types

Impacts