How severe is CVE-2020-12812?

CVE-2020-12812 has a CVSS 3.1 base score of 7.5 (HIGH). EPSS estimates a 49.3% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2020-12812: Fortinet FortiOS SSL VPN Improper Authentication

CISA Known Exploited Vulnerabilities

Fortinet FortiOS SSL VPN Improper Authentication Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2021-11-03

Remediation due

2022-05-03

Ransomware

Known use

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 · CISA7.5 HIGH

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

SSVC · CISA-ADP

Exploitationactive

Automatableyes

Technical impactpartial

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 Links

Other references

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

Record Details

Published

2020-07-24

Last updated

2026-10-01

Assigner (CNA)

fortinet

Credited to

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.