CVE-2020-12812 on CISA KEV

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.

01What CISA says about this vulnerability

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.

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• fortiguard.com — https://fortiguard.com/psirt/FG-IR-19-283

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
n	a / Fortinet FortiOS	FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and below

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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