CVE-2023-26209

Name: CVE-2023-26209
Creator: NVD / NIST
Published: 2023-03-09T15:15:09.72+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.75%

Last modified Jun 17, 2026

CVE-2023-26209 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 1.75% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

1.75%

75.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Fortinet	Fortideceptor	>= 1.0.0, < 3.2.0

References

https://fortiguard.com/psirt/FG-IR-20-078Vendor Advisory
https://fortiguard.com/psirt/FG-IR-20-078Vendor Advisory

Timeline

Published: Mar 9, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-26209?

How severe is CVE-2023-26209?

CVE-2023-26209 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.75% probability of exploitation in the next 30 days.

How do I fix CVE-2023-26209?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-26209?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST