CVE-2023-26208 Denial of service in FortiAuthenticator

What is CVE-2023-26208?

CVE-2023-26208 is a low-severity denial of service vulnerability in Fortinet FortiAuthenticator, published on 9 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A improper restriction of excessive authentication attempts vulnerability [CWE-307] in Fortinet FortiAuthenticator 6.4.x and before allows a remote unauthenticated attacker to partially exhaust CPU and memory via sending numerous HTTP requests to the login form.

Weakness: CWE-307

Which versions are affected by CVE-2023-26208?

It affects 1 product.

Products include Fortinet Fortiauthenticator.

How do I fix CVE-2023-26208?

No fix has been published for CVE-2023-26208 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-2023-26208 being exploited?

There is no known exploitation of CVE-2023-26208 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Fortinet FortiAuthenticator

• CVE-2026-44277 Missing authorization in FortiAuthenticator Critical 9.1
• CVE-2013-6990 Privilege escalation in n/a Critical 9.0
• CVE-2021-43067 Information disclosure in Fortinet FortiAuthenticator High 8.3
• CVE-2021-22124 Denial of service in Fortinet FortiSandbox, FortiAuthenticator High 7.5
• CVE-2015-1455 Hardcoded credentials in n/a High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-33jw-84xq-w6fj.