CVE-2021-24012 Auth bypass in Fortinet FortiOS

What is CVE-2021-24012?

CVE-2021-24012 is a medium-severity authentication bypass vulnerability in Fortinet Fortios, published on 2 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An improper following of a certificate's chain of trust vulnerability in FortiGate versions 6.4.0 to 6.4.4 may allow an LDAP user to connect to SSLVPN with any certificate that is signed by a trusted Certificate Authority.

Weakness: CWE-295

Which versions are affected by CVE-2021-24012?

It affects 1 product.

Products include Fortinet Fortios.

How do I fix CVE-2021-24012?

No fix has been published for CVE-2021-24012 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2021-24012 being exploited?

There is no known exploitation of CVE-2021-24012 in the wild and no public exploit code.

Other vulnerabilities in Fortinet Fortios

• CVE-2024-23113 Fortinet Multiple Products Format String Exploited Critical 9.8
• CVE-2022-40684 Fortinet Multiple Products Authentication Bypass Exploited Critical 9.8
• CVE-2024-55591 Fortinet FortiOS and FortiProxy Authentication Bypass Exploited Critical 9.6
• CVE-2024-21762 Fortinet FortiOS Out-of-Bound Write Exploited Critical 9.6
• CVE-2022-42475 Fortinet FortiOS Heap-Based Buffer Overflow Exploited Critical 9.3

All Fortinet Fortios vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-2fg7-gvqp-mhcc.