What is CVE-2020-11957?

CVE-2020-11957 is a high-severity vulnerability in Cypress Psoc 4.2 Ble, classified under Insufficient Entropy. CVSS score: 7.5/10. Published 2020-06-09.

How severe is CVE-2020-11957?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Cypress Psoc 4.2 Ble

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.

EPSS: 0.004 (32.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Cypress Psoc_4.2_ble
N/a — versions n/a

Weakness classification (CWE)

CWE-331 — Insufficient Entropy

References

cve@mitre.org (x_refsource_CONFIRM, Product, Vendor Advisory)

Frequently asked questions

What is CVE-2020-11957?: CVE-2020-11957 is a high-severity vulnerability in Cypress Psoc 4.2 Ble, classified under Insufficient Entropy. CVSS score: 7.5/10. Published 2020-06-09.
How severe is CVE-2020-11957?: High severity. CVSS v3 base score is 7.5 out of 10.