Is CVE-2020-11957 in the CISA KEV catalog?

No. CVE-2020-11957 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-11957?

CVE-2020-11957 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-11957?

CVE-2020-11957 has an EPSS score of 0.39% (31th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-11957?

Upgrade psoc 4.2 ble to 3.64 or later.

CVE & CISA-KEV Catalog

CVE-2020-11957

HIGH

7.5

CVSS v3

NVD

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.

CWE-331

How to fix

Remediation Available

psoc 4.2 bleNVD

Affected:< 3.64Fixed in:3.64CVE-2020-11957derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorAdjacent

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.39%probability of exploitation in 30 days

31stpercentile

Low risk: more likely to be exploited than 31% of all known CVEs.

References

Vendor Advisory1

cypress.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.