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CVE-2020-12812

CRITICAL9.8
CISA KEV

Published 2020-07-24 · Updated 2026-10-02 · Source psirt@fortinet.com

Summary

CVE-2020-12812 is a critical-severity (CVSS 9.8) vulnerability in Fortinet FortiOS. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 3, 2022. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Fortinet has 31 vulnerabilities in the KEV catalog, 14 of them linked to ransomware.

All 31 known-exploited Fortinet vulnerabilities →

Description

An improper authentication vulnerability in SSL VPN in FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and below may result in a user being able to log in successfully without being prompted for the second factor of authentication (FortiToken) if they changed the case of their username.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-178CWE-287CWE-287

CISA Known-Exploited Vulnerability

Product: Fortinet — FortiOS

Name: Fortinet FortiOS SSL VPN Improper Authentication Vulnerability

Date added: 2021-11-03 · Due: 2022-05-03

USED IN RANSOMWARE

Required action: Apply updates per vendor instructions.

View on NVD