CVE-2020-12812
Fortinet FortiOS SSL VPN Improper Authentication Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply updates per vendor instructions.
CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2020-12812
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.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NExploitation Context
as of October 15, 2026- CISA added CVE-2020-12812 to the KEV catalog 467 days after its CVE record was published.
- It is one of 31 Fortinet entries in the CISA KEV catalog, and one of 4 added in 2021.
- Its current EPSS score (45.4%) is higher than that of 48% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| - | Fortinet FortiOS | FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and below |
References
1 LinksRecord Details
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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.