CVE-2020-12812

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National Vulnerability Database Information

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.

CVSS Base Score: 9.8 (v3.1)

The CVSS Base Score is a score from 0 to 10 that represents the intrinsic severity of a vulnerability. A higher score indicates greater severity.

Value

0.02.55.07.510.0

Published on: 07/24/2020 23:15:12
Last modified: 06/17/2026 02:52:20
NIST: CVE source from the National Vulnerability Database (NVD)

CVSS Metrics Details

Base Severity: CRITICAL
Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality Impact: HIGH
Integrity Impact: HIGH
Availability Impact: HIGH

Common Weakness Enumeration (CWE)

Database CWE: v4.18

CWE-178: Improper Handling of Case Sensitivity ↗

The product does not properly account for differences in case sensitivity when accessing or determining the properties of a resource, leading to inconsistent results.

CWE-287: Improper Authentication ↗

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Fonte: MITRE CWE

FIRST Information

EPSS Score: 0.4934

The EPSS (Exploit Prediction Scoring System) is a score from 0 to 1 that indicates the probability that a vulnerability will be exploited in the real world in the next 30 days. A higher value indicates a greater likelihood of exploitation.

Value

0.00.250.50.751.0

Percentile: 0.9875

The Percentile indicates how much higher this vulnerability's EPSS score is compared to all other vulnerabilities in the EPSS database. For example, a percentile of 0.90 (90%) means that 90% of vulnerabilities have an EPSS score equal to or lower than the current one.

Value

0.00.250.50.751.0

*Data updated as of: 2026-07-03

CISA Information (Known Exploited Vulnerabilities)

The CISA KEV Catalog lists vulnerabilities that have been actively exploited in the real world. If a CVE is present in this catalog, it indicates that the threat is immediate and mitigation should be a top priority.

CVE CVE-2020-12812 IS PRESENT in the CISA KEV Catalog!

Vulnerability Name: Fortinet FortiOS SSL VPN Improper Authentication Vulnerability
Short 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.
Date Added to KEV: 11/03/2021
Vendor/Product: Fortinet / FortiOS
Required Action: Apply updates per vendor instructions.
Due Date: 05/03/2022

Articles published on Red Hot Cyber

NVD References

Exploit PoC from GitHub

No results found on GitHub for this CVE.