CVE-2021-24018 Memory corruption in Fortinet FortiOS

What is CVE-2021-24018?

CVE-2021-24018 is a medium-severity memory corruption vulnerability in Fortinet Fortios, published on 4 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A buffer underwrite vulnerability in the firmware verification routine of FortiOS before 7.0.1 may allow an attacker located in the adjacent network to potentially execute arbitrary code via a specifically crafted firmware image.

Weakness: CWE-787

Which versions are affected by CVE-2021-24018?

It affects 1 product.

Products include Fortinet Fortios.

How do I fix CVE-2021-24018?

No fix has been published for CVE-2021-24018 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-2021-24018 being exploited?

There is no known exploitation of CVE-2021-24018 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-q8x9-vj32-mh5w.