CVE-2021-20230

Severity CVSS v4.0:
Pending analysis
Type:
CWE-295 Improper Certificate Validation
Publication date:
23/02/2021
Last modified:
01/06/2022

Description

A flaw was found in stunnel before 5.57, where it improperly validates client certificates when it is configured to use both redirect and verifyChain options. This flaw allows an attacker with a certificate signed by a Certificate Authority, which is not the one accepted by the stunnel server, to access the tunneled service instead of being redirected to the address specified in the redirect option. The highest threat from this vulnerability is to confidentiality.

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:stunnel:stunnel:*:*:*:*:*:*:*:* 5.57 (excluding)