CVE-2023-52353: Arm Mbed TLS

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

An issue was discovered in Mbed TLS through 3.5.1. In mbedtls_ssl_session_reset, the maximum negotiable TLS version is mishandled. For example, if the last connection negotiated TLS 1.2, then 1.2 becomes the new maximum.

Affected products

• Arm Mbed TLS: before 3.5.2 (fixed in 3.5.2)

Published 2024-01-21. Last modified 2026-06-17.