How severe is CVE-2021-24023?

CVE-2021-24023 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-24023 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-24023?

CVE-2021-24023 affects Fortinet Fortiai Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-24023?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-24023 published?

CVE-2021-24023 was published on 2021-06-03 and last updated on 2026-06-17.

CVE-2021-24023

CVE-2021-24023 is a high-severity vulnerability in Fortinet Fortiai Firmware with a CVSS 3.x base score of 7.8. 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-78.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 9.0
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Fortinet Fortiai Firmware
Published: 2021-06-03
Last modified: 2026-06-17

Description

An improper input validation in FortiAI v1.4.0 and earlier may allow an authenticated user to gain system shell access via a malicious payload in the "diagnose" command.

Frequently asked questions

What is CVE-2021-24023?: An improper input validation in FortiAI v1.4.0 and earlier may allow an authenticated user to gain system shell access via a malicious payload in the "diagnose" command.
How severe is CVE-2021-24023?: CVE-2021-24023 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-24023 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-24023?: CVE-2021-24023 affects Fortinet Fortiai Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-24023?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-24023 published?: CVE-2021-24023 was published on 2021-06-03 and last updated on 2026-06-17.

References

https://fortiguard.com/advisory/FG-IR-21-033

Affected products (1)

cpe:2.3:o:fortinet:fortiai_firmware:*:*:*:*:*:*:*:*

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