CVE-2020-12812

CriticalCVSS 9.8/10Known exploited (CISA KEV)Last modified Oct 2, 2026

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-178 CWE-287

Affected software

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

References

https://fortiguard.com/psirt/FG-IR-19-283Vendor Advisory
https://fortiguard.com/psirt/FG-IR-19-283Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-12812US Government Resource

Timeline

Published: Jul 24, 2020
Last modified: Oct 2, 2026
Added to CISA KEV: Nov 3, 2021
NVD status: Analyzed

Related CVEs from 2020

CVE-2020-128145.4A improper neutralization of input during web page generation ('cross-site scripting') in Fortinet FortiAnalyzer version 6.0.6 and below, ve CVE-2020-128155.4An improper neutralization of input vulnerability in FortiTester before 3.9.0 may allow a remote authenticated attacker to inject script rel CVE-2020-128166.1An improper neutralization of input vulnerability in FortiNAC before 8.7.2 may allow a remote authenticated attacker to perform a stored cro CVE-2020-128178.8An improper neutralization of input vulnerability in FortiAnalyzer before 6.4.1 and 6.2.5 may allow a remote authenticated attacker to injec CVE-2020-128185.3An insufficient logging vulnerability in FortiGate before 6.4.1 may allow the traffic from an unauthenticated attacker to Fortinet owned IP CVE-2020-128197.5A heap-based buffer overflow vulnerability in the processing of Link Control Protocol messages in FortiGate versions 5.6.12, 6.0.10, 6.2.4 a CVE-2020-12827.8An elevation of privilege vulnerability exists when the Windows Runtime improperly handles objects in memory, aka 'Windows Runtime Elevation CVE-2020-128208.8Under non-default configuration, a stack-based buffer overflow in FortiOS version 6.0.10 and below, version 5.6.12 and below may allow a rem CVE-2020-128219.8Gossipsub 1.0 does not properly resist invalid message spam, such as an eclipse attack or a sybil attack.CVE-2020-128239.8OpenConnect 8.09 has a buffer overflow, causing a denial of service (application crash) or possibly unspecified other impact, via crafted ce CVE-2020-128247.5Pexip Infinity 23.x before 23.3 has improper input validation, leading to a temporary software abort via RTP.CVE-2020-128257.1libcroco through 0.6.13 has excessive recursion in cr_parser_parse_any_core in cr-parser.c, leading to stack consumption.