CVE-2020-12812 (GCVE-0-2020-12812)

Vulnerability from cvelistv5 – Published: 2020-07-24 22:28 – Updated: 2025-10-21 23:35
VLAI? CISA KEV
Summary
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 ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • Improper Access Control
Assigner
References
Impacted products
Vendor Product Version
n/a Fortinet FortiOS Affected: FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and below
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: c5a55a99-a8a1-4cb4-9a06-091101108ace

Vulnerability ID: CVE-2020-12812

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Fortinet FortiOS SSL VPN Improper Authentication Vulnerability | Affected: Fortinet / FortiOS | Description: 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. | Required action: Apply updates per vendor instructions. | Due date: 2022-05-03 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2020-12812
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-178 CWE-287
Feed CISA Known Exploited Vulnerabilities Catalog
Product FortiOS
Due Date 2022-05-03
Date Added 2021-11-03
Vendorproject Fortinet
Vulnerabilityname Fortinet FortiOS SSL VPN Improper Authentication Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 12:28 UTC | Updated: 2026-02-06 07:17 UTC
Show details on NVD website
To clipboard 

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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.