CVE-2020-11957

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.

• CVE ID
• CVE-2020-11957

• Assigner
• cve@mitre.org

• Vulnerability Status
• Analyzed

• Published Version
• 2020-06-09T19:15:10

• Last Modified Date
• 2020-06-22T13:42:04

• Version
• 2.0

• Vector String
• AV:A/AC:M/Au:N/C:P/I:P/A:P

• Access Vector
• ADJACENT_NETWORK

• Access Compatibility
• MEDIUM

• Authentication
• NONE

• Confidentiality Impact
• PARTIAL

• Integrity Impact
• PARTIAL

• Availability Impact
• PARTIAL

• Base Score
• 5.4

• Severity
• MEDIUM

• Exploitability Score
• 5.5

• Impact Score
• 6.4

• Version
• 3.1

• Vector String
• CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

• Attack Vector
• ADJACENT_NETWORK

• Attack Compatibility
• HIGH

• Privileges Required
• NONE

• User Interaction
• NONE

• Scope
• UNCHANGED

• Confidentiality Impact
• HIGH

• Availability Impact
• HIGH

• Base Score
• 7.5

• Base Severity
• HIGH

• Exploitability Score
• 1.6

• Impact Score
• 5.9