CVE-2022-27491 Denial of service in Fortinet FortiOS

What is CVE-2022-27491?

CVE-2022-27491 is a medium-severity denial of service vulnerability in Fortinet Fortios, published on 6 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A improper verification of source of a communication channel in Fortinet FortiOS with IPS engine version 7.201 through 7.214, 7.001 through 7.113, 6.001 through 6.121, 5.001 through 5.258 and before 4.086 allows a remote and unauthenticated attacker to trigger the sending of "blocked page" HTML data to an arbitrary victim via crafted TCP requests, potentially flooding the victim.

Which versions are affected by CVE-2022-27491?

It affects 1 product.

Products include Fortinet Fortios.

How do I fix CVE-2022-27491?

No fix has been published for CVE-2022-27491 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2022-27491 being exploited?

There is no known exploitation of CVE-2022-27491 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-x3p7-q669-8j5v.