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CVE-2020-11957

HIGH
7.5
CVSS Score
Published: June 9, 2020 at 06:26 PM UTC
Updated: June 17, 2026 at 02:51 AM UTC
1 product affected across 1 vendorPsoc 4.2 Ble

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%

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.

Affected

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

Psoc 4.2 Ble· Cypress
95%
v < 3.64
Affected range stops below 3.64, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

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

Patch and advisory references

References (1)

x_refsource_CONFIRMProductVendor Advisory
Source: [email protected]
https://www.cypress.com/file/504466/download

CVSS

7.5HIGH[email protected]
Attack Vector
ADJACENT_NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-331

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