UpHeron
All vulnerabilities

Servers and applications

CVE-2020-12812

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.

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021.

Severity
Critical 9.8
Published
24 Jul 2020
Last changed
2 Oct 2026
Added to UpHeron
1 Nov 2026
Fixed in
6.0.10, 6.2.4
Sources
NVD

Affected software

SoftwareAffected versions
Fortinet FortiOSServers and applications · cpe:o:fortinet:fortios
  • Every version before 6.0.10
  • From 6.2.0 before 6.2.4
  • Version 6.4.0

Known exploited

CISA name
Fortinet FortiOS SSL VPN Improper Authentication Vulnerability
Required action
Apply updates per vendor instructions.
Due for US agencies
3 May 2022
Used in ransomware
Yes, known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2020-12812
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2020-12812