# 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.

- Page: https://www.vulneraibility.com/cve/CVE-2020-12812
- CVSS: 9.8
- Known exploited: yes, in CISA KEV since 2021-11-03; CISA due date 2022-05-03; known ransomware use
- EPSS: 45.38% (percentile 98.8)
- CISA SSVC: exploitation active, automatable yes, technical impact partial (assessed 2026-08-12)
- Weakness: CWE-287
- Published: 2020-07-24

## Affected versions

- Fortinet FortiOS: affected FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and below

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://fortiguard.com/psirt/FG-IR-19-283
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-12812

---
Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.