Improper Authentication in FortiOS - CVE-2020-12812

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Main Vulnerability Database Vulnerabilities #VU30135

Improper Authentication in FortiOS - CVE-2020-12812

Published: July 16, 2020 / Updated: January 5, 2026


Vulnerability identifier: #VU30135
CSH Severity: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber
CVE-ID: CVE-2020-12812
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability: The vulnerability is being exploited in the wild
Vulnerable software:
FortiOS
Software vendor:
Fortinet, Inc

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in when processing authentication requests in SSL VPN. A remote authenticated attacker can changed the case of their username and gain unauthorized access to the application without being prompted for the second factor of authentication (FortiToken).


Remediation

Install updates from vendor's website.

External links