What’s Vulnerable › Vulnerabilities

CVE-2020-36476

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-23 · updated 2026-06-17
• Weakness: CWE-212

Description

An issue was discovered in Mbed TLS before 2.24.0 (and before 2.16.8 LTS and before 2.7.17 LTS). There is missing zeroization of plaintext buffers in mbedtls_ssl_read to erase unused application data from memory.

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: 9.0, 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://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/2021/11/msg00021.html
• https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
• 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/2021/11/msg00021.html
• https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html

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