CVE-2020-36426

Name: CVE-2020-36426
Creator: NVD / NIST
Published: 2021-07-19T17:15:11.367+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.69%

Last modified Jun 17, 2026

CVE-2020-36426 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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).. EPSS estimates a 1.69% chance of exploitation in the next 30 days.

Description

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).

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.69%

74.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Arm	Mbed Tls	< 2.7.17
Arm	Mbed Tls	>= 2.8.0, < 2.16.8
Arm	Mbed Tls	>= 2.17.0, < 2.24.0
Debian	Debian Linux	10.0

References

https://bugs.gentoo.org/740108Issue Tracking, Third Party Advisory
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.8Release Notes, Third Party Advisory
https://github.com/ARMmbed/mbedtls/releases/tag/v2.24.0Release Notes, Third Party Advisory
https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.17Release Notes, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlMailing List, Third Party Advisory
https://bugs.gentoo.org/740108Issue Tracking, Third Party Advisory
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.8Release Notes, Third Party Advisory
https://github.com/ARMmbed/mbedtls/releases/tag/v2.24.0Release Notes, Third Party Advisory
https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.17Release Notes, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlMailing List, Third Party Advisory

Timeline

Published: Jul 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-36426?

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).

How severe is CVE-2020-36426?

CVE-2020-36426 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.69% probability of exploitation in the next 30 days.

How do I fix CVE-2020-36426?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-36426?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST