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AUSCERT External Security Bulletin Redistribution
FortiOS - Improper verification of the user certificate's
chain of trust in FortiGate when connecting to SSL-VPN
2 June 2021
AusCERT Security Bulletin Summary
Publisher: FortiGuard Labs
Operating System: Network Appliance
Impact/Access: Reduced Security -- Existing Account
CVE Names: CVE-2021-24012
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FortiOS - Improper verification of the user certificate's chain of trust in FortiGate when connecting to SSL-VPN
IR Number : FG-IR-21-018
Date : Jun 01, 2021
Risk : 3/5
CVSSv3 Score : 6.4
Impact : Impersonation
CVE ID : CVE-2021-24012
An improper following of a certificate's chain of trust vulnerability in
FortiGate SSL-VPN may allow an LDAP user to connect to VPN with any certificate
that is signed by a trusted Certificate Authority.
FortiGate version 6.4.0 to 6.4.4. FortiGate versions 5.6.x, 6.0.x and 6.2.x are
NOT impacted by this vulnerability.
Please upgrade to FortiGate Version 6.4.5 or above.
Please upgrade to FortiGate Version 7.0.0.
Fortinet is pleased to thank Maria Teresa Munoz Blanco from Vectoritcgroup for
reporting this vulnerability under responsible disclosure.
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