Improper certificate validation in FortiOS - CVE-2021-24012

Vulnerability identifier: #VU53716

CSH Severity: Medium

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2021-24012

CWE-ID: CWE-295

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
FortiOS

Software vendor:
Fortinet, Inc

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to improper verification of the user certificate's chain of trust when connecting to SSL-VPN. A remote LDAP user with any certificate that is signed by a trusted Certificate Authority can connect to VPN server.

Install updates from vendor's website.

• https://www.fortiguard.com/psirt/FG-IR-21-018