2020-36422 | ARM Mbed TLS ECC Private Key mbedtls_ecp_mul_restartable information exposure

CVSS Meta Temp Score

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Current Exploit Price (≈)

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CTI Interest Score

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2.5 $0-$5k 0.89

A vulnerability has been found in ARM Mbed TLS up to 2.16.6/2.22.x and classified as problematic. This vulnerability affects the function mbedtls_ecp_check_pub_priv/mbedtls_pk_parse_key/mbedtls_pk_parse_keyfile/mbedtls_ecp_mul/mbedtls_ecp_mul_restartable of the component ECC Private Key Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-203. As an impact it is known to affect confidentiality. CVE summarizes:

An issue was discovered in Arm Mbed TLS before 2.23.0. A side channel allows recovery of an ECC private key, related to mbedtls_ecp_check_pub_priv, mbedtls_pk_parse_key, mbedtls_pk_parse_keyfile, mbedtls_ecp_mul, and mbedtls_ecp_mul_restartable.

The weakness was presented 07/19/2021. The advisory is shared for download at bugs.gentoo.org. This vulnerability was named CVE-2020-36422 since 07/19/2021. The exploitation appears to be difficult. The attack needs to be done within the local network. A single authentication is necessary for exploitation. There are known technical details, but no exploit is available.

Upgrading to version 2.16.7 or 2.23.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.



VulDB Meta Base Score: 2.6
VulDB Meta Temp Score: 2.5

VulDB Base Score: 2.6
VulDB Temp Score: 2.5
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: Information disclosure
CWE: CWE-203
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 2.16.7/2.23.0

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-2020-36422 (🔒)

Created: 07/19/2021 21:39
Updated: 07/22/2021 10:04
Changes: (2) source_cve_assigned source_cve_nvd_summary
Complete: 🔍


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