CVE-2020-11957: The Bluetooth Low Energy implementation in Cypress PSoC Creator BLE 4.2 component versions before 3.64 generat

Q: How do I fix CVE-2020-11957?

psoc 4.2 ble: upgrade to 3.64. Exact commands for each OS are on this page.

Q: Is CVE-2020-11957 being exploited?

CVE-2020-11957 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-11957 affect?

CVE-2020-11957 affects psoc 4.2 ble. Severity is high (CVSS 7.5). 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 ca

Routine

HIGH 7.5UPGRADE

CVE-2020-11957 is a high-severity flaw (CVSS 7.5) affecting psoc 4.2 ble. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-331
Published	2020-06-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cypress

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-06-09 19:15 UTCPublished CVE record published
2026-06-17 02:51 UTCUpdated Record last modified

cypress psoc 4.2 ble UPGRADE

Affected: < 3.64

Fixed in: 3.64

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy psoc-4.2-ble || rpm -q psoc-4.2-ble || psoc-4.2-ble --version

2. UPGRADE to 3.64 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade psoc-4.2-ble

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade psoc-4.2-ble

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-11957?

psoc 4.2 ble: upgrade to 3.64. Exact commands for each OS are on this page.

Is CVE-2020-11957 being exploited?

CVE-2020-11957 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-11957 affect?

CVE-2020-11957 affects psoc 4.2 ble. Severity is high (CVSS 7.5). 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 ca

How urgent is CVE-2020-11957?

Priority 35/100. High severity

Software pages

Bluetooth vulnerabilities

References

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