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CVE-2023-26209

MediumPublished

A improper restriction of excessive authentication attempts vulnerability [CWE-307] in Fortinet FortiDeceptor 3.1.x and before allows a remote...

Published: Mar 9, 2023
Updated: Oct 22, 2024
Assigning CNA: fortinet
Evidence observed: Aug 8, 2026

Primary CVSS

5.3/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS probability estimate

1.7%

Low · next 30 days

Percentile: 76.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

A improper restriction of excessive authentication attempts vulnerability [CWE-307] in Fortinet FortiDeceptor 3.1.x and before allows a remote unauthenticated attacker to partially exhaust CPU and memory via sending numerous HTTP requests to the login form.

Sources

CVE-2023-26209PoC
Python script with a Tkinter GUI for sending automated payloads of configurable size to a login endpoint, designed for educational testing of server response to varying payload lengths.

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