2020-36426 | ARM Mbed TLS mbedtls_x509_crl_parse_der buffer overflow

CVSS Meta Temp Score

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Current Exploit Price (≈)

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CTI Interest Score

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5.3 $0-$5k 0.29

A vulnerability was found in ARM Mbed TLS up to 2.7.16/2.16.7/2.23.x. It has been classified as critical. Affected is the function mbedtls_x509_crl_parse_der. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-120. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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).

The weakness was published 07/19/2021. The advisory is available at bugs.gentoo.org. This vulnerability is traded as CVE-2020-36426 since 07/19/2021. The exploitability is told to be easy. Access to the local network is required for this attack. The requirement for exploitation is a authentication. Technical details are known, but there is no available exploit.

Upgrading to version 2.7.17, 2.16.8 or 2.24.0 eliminates this vulnerability.



VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

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Vector Complexity Authentication Confidentiality Integrity Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Memory corruption
CWE: CWE-120
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mbed TLS 2.7.17/2.16.8/2.24.0

07/19/2021 Advisory disclosed
07/19/2021 +0 days CVE assigned
07/19/2021 +0 days VulDB entry created
07/22/2021 +3 days VulDB last updateAdvisory: bugs.gentoo.org
Status: Confirmed

CVE: CVE-2020-36426 (🔒)

Created: 07/19/2021 21:42
Updated: 07/22/2021 10:12
Changes: (2) source_cve_assigned source_cve_nvd_summary
Complete: 🔍


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