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CVE-2020-36478

Published: 23 August 2021

An issue was discovered in Mbed TLS before 2.25.0 (and before 2.16.9 LTS and before 2.7.18 LTS). A NULL algorithm parameters entry looks identical to an array of REAL (size zero) and thus the certificate is considered valid. However, if the parameters do not match in any way, then the certificate should be considered invalid.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
mbedtls
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Needs triage

bionic Needs triage

focal Needs triage

hirsute Not vulnerable
(2.16.9-0.1ubuntu1)
impish Not vulnerable

kinetic Not vulnerable

lunar Not vulnerable

jammy Not vulnerable

upstream
Released (2.16.9-0.1)
mantic Not vulnerable

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N