CVE-2020-36426: Arm Mbed TLS

High severity, CVSS 7.5. EPSS: 1.7% chance of exploitation in the next 30 days.

An issue was discovered in Arm Mbed TLS before 2.24.0. mbedtls_x509_crl_parse_der has a buffer over-read (of one byte).

Affected products

• Arm Mbed TLS: before 2.7.17 (fixed in 2.7.17); from 2.8.0, before 2.16.8 (fixed in 2.16.8); from 2.17.0, before 2.24.0 (fixed in 2.24.0)
• Debian Debian Linux: version 10.0 only

Published 2021-07-19. Last modified 2026-06-17.