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.

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

45% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-25)

CISA KEV

listed 2021-11-03, due 2022-05-03, known ransomware use

CWEs

CWE-178, CWE-287

Published

2020-07-24

Modified

2026-10-02

Record from

the NVD, synced 2026-10-19

Affected

• fortinet:fortios

References

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

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