How severe is CVE-2023-26209?

CVE-2023-26209 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2023-26209 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-26209?

CVE-2023-26209 affects Fortinet Fortideceptor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-26209?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-26209 published?

CVE-2023-26209 was published on 2023-03-09 and last updated on 2026-06-17.

CVE-2023-26209

CVE-2023-26209 is a low-severity vulnerability in Fortinet Fortideceptor with a CVSS 3.x base score of 3.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-307.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-307
Affected product: Fortinet Fortideceptor
Published: 2023-03-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-26209?: 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.
How severe is CVE-2023-26209?: CVE-2023-26209 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2023-26209 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26209?: CVE-2023-26209 affects Fortinet Fortideceptor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-26209?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-26209 published?: CVE-2023-26209 was published on 2023-03-09 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:fortinet:fortideceptor:*:*:*:*:*:*:*:*

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