CVE-2020-11957
Last modified
CVE-2020-11957 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The Bluetooth Low Energy implementation in Cypress PSoC Creator BLE 4.2 component versions before 3.64 generates a random number (Pairing Random) with significantly less entropy than the specified 128 bits during BLE pairing. This is the case for both authenticated and unauthenticated pairing with both LE Secure Connections as well as LE Legacy Pairing. EPSS estimates a 0.39% chance of exploitation in the next 30 days.
Description
The Bluetooth Low Energy implementation in Cypress PSoC Creator BLE 4.2 component versions before 3.64 generates a random number (Pairing Random) with significantly less entropy than the specified 128 bits during BLE pairing. This is the case for both authenticated and unauthenticated pairing with both LE Secure Connections as well as LE Legacy Pairing. A predictable or brute-forceable random number allows an attacker (in radio range) to perform a MITM attack during BLE pairing.
Metrics
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cypress | Psoc 4.2 Ble | < 3.64 |
References
- https://www.cypress.com/file/504466/downloadProduct, Vendor Advisory
- https://www.cypress.com/file/504466/downloadProduct, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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