Which versions of RS9116 SDK are affected by EUVD-2026-30381?

Silicon Labs RS9116 SDK versions up to 2.13.1 contain a cryptographic weakness in the hardware random number generator that produces predictable values during power-save mode operation, directly…. A patch is available.

How to fix or mitigate EUVD-2026-30381?

Within 24 hours: Inventory all systems and IoT devices using Silicon Labs RS9116 SDK and document current firmware versions. Within 7 days: Obtain and test the vendor patch from Silicon Labs GitHub repository and develop a staged deployment plan for affected devices, prioritizing authentication-critical and data-sensitive deployments. Within 30 days: Complete patching of all RS9116 SDK instances to version 2.14.0 or later (or confirmed fixed version per vendor advisory), and conduct cryptographic validation testing on patched devices to confirm entropy restoration.

RS9116 SDK EUVD-2026-30381

Q: What is the CVSS score of EUVD-2026-30381?

EUVD-2026-30381 has a CVSS 4.0 base score of 7.4 (High). CVSS vector: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

| CVE-2026-3290 HIGH

Insufficient Entropy in PRNG (CWE-332)

2026-05-14 Silabs

GHSA-rjvv-82rg-ppqh

Information Disclosure Rs9116 Sdk

7.4

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

7.4 HIGH

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

Scope

Lifecycle Timeline

Analysis Generated

May 14, 2026 - 21:49 vuln.today

CVSS changed

May 14, 2026 - 20:22 NVD

7.4 (HIGH)

CVE Published

May 14, 2026 - 19:24 nvd

UNKNOWN (no severity yet)

CVE Published

May 14, 2026 - 19:24 nvd

HIGH 7.4

DescriptionCVE.org

Timing limitations of the HRNG in RS9116 when power save mode is enabled results in predictable values

AnalysisAI

Hardware random number generator (HRNG) in Silicon Labs RS9116 SDK versions up to 2.13.1 produces predictable cryptographic values when the wireless module operates in power save mode, enabling adjacent attackers with user interaction to compromise encrypted communications and authentication mechanisms. Vendor patch available via GitHub; no active exploitation confirmed but cryptographic weakness poses high risk to WiFi/Bluetooth IoT deployments relying on the affected module's entropy source.

Technical ContextAI

The RS9116 is a WiFi/Bluetooth combo wireless module from Silicon Labs targeting IoT applications. This vulnerability (CWE-332: Insufficient Entropy) affects the hardware random number generator (HRNG) component within the RS9116 SDK. When power save mode is enabled-a common configuration to extend battery life in IoT devices-timing constraints on the HRNG's operation introduce deterministic patterns in the generated random values. Cryptographic operations requiring entropy (key generation, nonce creation, session token generation) become predictable, fundamentally breaking the security assumptions of encryption, authentication protocols like WPA2/WPA3, and Bluetooth pairing. The affected product identified by CPE cpe:2.3:a:silicon_labs:rs9116_sdk:*:*:*:*:*:*:*:* encompasses all SDK versions through 2.13.1.

RemediationAI

Upgrade to RS9116 SDK version 2.13.2 or later, which addresses the HRNG timing vulnerability in power save mode. Patched firmware and SDK components are available from the Silicon Labs WiseConnect GitHub repository at https://github.com/SiliconLabs/wiseconnect-wifi-bt-sdk/. Consult the vendor advisory at https://siliconlabs.lightning.force.com/sfc/servlet.shepherd/document/download/069Vm00000nIg6IIAS for migration guidance and compatibility notes. If immediate patching is not feasible, DISABLE POWER SAVE MODE on RS9116 modules to eliminate timing constraints on the HRNG-this trades increased power consumption for restored entropy quality and is suitable for mains-powered deployments but degrades battery life in portable devices. Additionally, implement application-layer cryptographic key diversification using external entropy sources (host MCU TRNG, server-provided session material) to reduce reliance on the module's HRNG-this requires application code changes and does not fully mitigate the vulnerability but provides defense-in-depth. Audit existing deployed devices for power save configuration and prioritize firmware updates for battery-operated units in security-sensitive roles.