CVE-2021-36173 Memory corruption in Fortinet FortiOS

What is CVE-2021-36173?

CVE-2021-36173 is a high-severity memory corruption vulnerability in Fortinet Fortios, published on 8 Dec 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

A heap-based buffer overflow in the firmware signature verification function of FortiOS versions 7.0.1, 7.0.0, 6.4.0 through 6.4.6, 6.2.0 through 6.2.9, and 6.0.0 through 6.0.13 may allow an attacker to execute arbitrary code via specially crafted installation images.

Weakness: CWE-787

Which versions are affected by CVE-2021-36173?

It affects 1 product.

Products include Fortinet Fortios.

How do I fix CVE-2021-36173?

No fix has been published for CVE-2021-36173 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-2021-36173 being exploited?

There is no known exploitation of CVE-2021-36173 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-p5m6-c47j-fg8m.