CVEvulnerability

CVE-2020-12812

9.8 CRITICAL Known exploited Published 2020-07-24 Modified 2026-10-02 Official page ↗

CISA Known Exploited Vulnerability

Fortinet FortiOS SSL VPN Improper Authentication Vulnerability — Fortinet FortiOS

Fortinet FortiOS SSL VPN contains an improper authentication vulnerability that may allow a user to login successfully without being prompted for the second factor of authentication (FortiToken) if they change the case in their username.

Added to KEV
2021-11-03
Remediation due
2022-05-03
Ransomware use
Known
Required action
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2020-12812
Status
Analyzed
Published
2020-07-24
Last modified
2026-10-02
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0 ([email protected])
7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P
Weaknesses
CWE-178, CWE-287

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.

Affected configurations

• fortinet fortios (< 6.0.10) • fortinet fortios (>= 6.2.0 < 6.2.4) • fortinet fortios 6.4.0

Related

Weakness · CWE (2)

  • CWE-178 Improper Handling of Case Sensitivity weakness
  • CWE-287 Improper Authentication weakness

Referenced by CWE · observed example (1)

  • CWE-287 Improper Authentication weakness

References