CVE-2025-53844 Memory corruption in FortiOS

What is CVE-2025-53844?

CVE-2025-53844 is a high-severity memory corruption vulnerability in Fortinet Fortios, published on 12 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A out-of-bounds write vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11 allows attacker to execute unauthorized code or commands via specially crafted packets.

Weakness: CWE-787

Which versions are affected by CVE-2025-53844?

It affects 1 product.

Products include Fortinet Fortios.

How do I fix CVE-2025-53844?

No fix has been published for CVE-2025-53844 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2025-53844 being exploited?

There is no known exploitation of CVE-2025-53844 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-67q8-5ppc-5hgr.