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CVE-2020-12812 is an improper authentication vulnerability affecting Fortinet FortiOS SSL VPN in versions 6.4.0, 6.2.0 through 6.2.3, and 6.0.9 and earlier. In configurations combining locally configured FortiToken two-factor authentication with remote authentication such as LDAP, inconsistent username case handling between FortiGate and the remote directory can allow a user with valid credentials to bypass the second-factor requirement by changing username capitalization. The altered username can bypass matching against the local MFA-protected account and fall back to direct directory authentication, permitting SSL VPN access without a FortiToken challenge. Exploitation has been observed in the wild, including use by Hive ransomware actors.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
118 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authentication bypass vulnerability in Fortinet FortiOS SSL VPN, cited among perimeter vulnerabilities exploited by Iranian-linked threat groups.
FortiOS SSL VPN improper authentication issue that can allow login without being prompted for second-factor authentication under certain configurations; reported abused in the wild.
A critical 2FA bypass vulnerability in Fortinet firewalls, still actively exploited five years after disclosure.
A vulnerability in FortiOS (CVE-2020-12812) allows attackers to bypass two-factor authentication (2FA), potentially granting unauthorized access to affected Fortinet devices.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.