CVE-2026-6924

Weak entropy initialization in Silicon Labs Matter SiWx917 TinyCrypt path

State: Published
Severity: 8.7 High
Published: Jul 23, 2026
Updated: Jul 24, 2026
Reserved: Apr 23, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	Silabs

Weaknesses

CWE-336 Same Seed in Pseudo-Random Number Generator (PRNG)

Affected Products

Product	Versions
Silicon Labs Matter GithubSilicon Labs	0Affected

References

https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/a45Vm0000009SzZIAU?operationContext=S1vendor-advisorypermissions-required
https://github.com/SiliconLabs/matter/tree/release_2.3.1-1.3patch

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