CVE-2024-55599 Security feature bypass in FortiOS

What is CVE-2024-55599?

CVE-2024-55599 is a medium-severity vulnerability in Fortinet Fortios, published on 8 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An Improperly Implemented Security Check for Standard vulnerability [CWE-358] in FortiOS version 7.6.0, version 7.4.7 and below, 7.0 all versions, 6.4 all versions and FortiProxy version 7.6.1 and below, version 7.4.8 and below, 7.2 all versions, 7.0 all versions may allow a remote unauthenticated user to bypass the DNS filter via Apple devices.

Weakness: CWE-358

Which versions are affected by CVE-2024-55599?

It affects 3 products.

Products include Fortinet Fortios, Fortinet Fortiproxy, Fortinet Fortisase.

How do I fix CVE-2024-55599?

No fix has been published for CVE-2024-55599 yet. Limit exposure of the affected software until one is available.

Is CVE-2024-55599 being exploited?

There is no known exploitation of CVE-2024-55599 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-j5ff-wp9g-xph9.