Actively exploited in the wild
Fortinet FortiOS SSL VPN Improper Authentication Vulnerability
Fortinet - FortiOS · Listed in the CISA KEV since 2021-11-03. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2020-12812
CriticalCVSS 9.8KEVExploitation Probability (EPSS)
Very high risk99th percentile - higher than 99% of all known CVEs
Summary
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.
Risk Assessment
A user can bypass the second authentication factor, increasing the risk of unauthorized access to the VPN and corporate resources.
Recommendation
Update FortiOS to a version that includes the fix and consider enforcing multi-factor authentication.
Original NVD description (English source)
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.