CVE-2017-14032: Arm Mbed TLS

High severity, CVSS 8.1. EPSS: 1.5% chance of exploitation in the next 30 days.

ARM mbed TLS before 1.3.21 and 2.x before 2.1.9, if optional authentication is configured, allows remote attackers to bypass peer authentication via an X.509 certificate chain with many intermediates. NOTE: although mbed TLS was formerly known as PolarSSL, the releases shipped with the PolarSSL name are not affected.

Affected products

• Arm Mbed TLS: version 1.3.19 only; version 1.3.21 only; version 2.1.7 only; version 2.1.9 only; version 2.4.2 only; version 2.6.2 only
• Trustedfirmware Mbed TLS: version 1.3.10 only; version 1.3.11 only; version 1.3.12 only; version 1.3.13 only; version 1.3.14 only; version 1.3.15 only; …

Published 2017-08-30. Last modified 2026-06-17.