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CVE-2026-6924

Weak entropy initialization in Silicon Labs Matter SiWx917 TinyCrypt path

HIGH
8.7
CVSS Score
Published: July 23, 2026 at 09:05 PM UTC
Updated: October 24, 2026 at 01:10 PM UTC
1 product affected across 1 vendorMatter

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Severity
HIGH8.7
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor AdvisoryPermissions Required
Source: cverecord
https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/a45Vm0000009SzZIAU?operationContext=S1
Patch
Source: cverecord
https://github.com/SiliconLabs/matter/tree/release_2.3.1-1.3

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHSilabs
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-336

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