CVE-2020-11957
CVE-2020-11957 is a high-severity vulnerability in Cypress Psoc 4.2 Ble with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-331.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.4
- EPSS exploit prediction: 0% (31st percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-331
- Affected product: Cypress Psoc 4.2 Ble
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2020-11957?
- CVE-2020-11957 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2020-11957 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-11957?
- CVE-2020-11957 affects Cypress Psoc 4.2 Ble. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-11957?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2020-11957 published?
- CVE-2020-11957 was published on 2020-06-09 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:cypress:psoc_4.2_ble:*:*:*:*:*:*:*:*
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