EUVD-2026-58076
GHSA-vm4r-7vjx-6f97
Severity by source
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:A for Bluetooth adjacency; AC:H because exploitation requires capturing a live pairing handshake and successfully brute-forcing the key offline; A:N as the description supports key recovery and eavesdropping, not denial of service.
Primary rating from Vendor (Silabs).
CVSS VectorVendor: Silabs
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
SMP security request (from peripheral) does not include the maximum encryption key size supported. Using a key with less than the maximum keysize makes brute-forcing the key easier. See V6 in BLERP paper linked below.
AnalysisAI
BLE encryption key downgrade in Silicon Labs WiseConnect allows adjacent, unauthenticated attackers to brute-force session keys. When a peripheral initiates SMP (Security Manager Protocol) pairing, WiseConnect's security request omits the device's maximum supported encryption key size. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to be within Bluetooth radio range (typically 10-100 meters depending on transmit power and environment) of a device running the affected WiseConnect BLE stack. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD-assigned CVSS 3.1 score of 8.8 (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) reflects the adjacent network vector (Bluetooth range) and full CIA impact if encryption is defeated. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker positioned within Bluetooth radio range of a WiseConnect-based peripheral waits for, or triggers, a BLE re-pairing event between the peripheral and a central device. The attacker captures the SMP pairing exchange - including the Pairing Confirm and Pairing Random PDUs - using a BLE sniffer. … |
| Remediation | The primary remediation is to upgrade WiseConnect/SiSDK to the fixed version referenced in Silicon Labs' release notes (https://docs.silabs.com/sisdk-release-notes/latest/sisdk-wifi-release-notes/sisdk-wifible-ble-release-notes and https://docs.silabs.com/rs9116-wiseconnect/latest/wifibt-wc-release-notes/rs9116-ble-release-notes#bug-fixes); consult those pages and the Silicon Labs community advisory at https://community.silabs.com/068Vm00000x0yyH for the exact patched SDK build. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems and devices using Silicon Labs WiseConnect and assess their network exposure and business criticality. …
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External POC / Exploit Code
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