What’s Vulnerable › Vulnerabilities

CVE-2020-36424

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-19 · updated 2026-06-17
• Weakness: CWE-203

Description

An issue was discovered in Arm Mbed TLS before 2.24.0. An attacker can recover a private key (for RSA or static Diffie-Hellman) via a side-channel attack against generation of base blinding/unblinding values.

Affected products

• mbedtls: before 2.7.17; from 2.8.0 before 2.16.8; from 2.17.0 before 2.24.0 — fixed in 2.16.8, 2.24.0, 2.7.17
• Debian Linux: 10.0

How to fix

Upgrade to a fixed version: mbedtls 2.16.8, 2.24.0, 2.7.17. Check the vendor advisory for mitigations.

References

• https://bugs.gentoo.org/740108
• https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.8
• https://github.com/ARMmbed/mbedtls/releases/tag/v2.24.0
• https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.17
• https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
• https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-09-2
• https://bugs.gentoo.org/740108
• https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.8
• https://github.com/ARMmbed/mbedtls/releases/tag/v2.24.0
• https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.17
• https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
• https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2020-09-2

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