How severe is CVE-2024-21756?

CVE-2024-21756 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2024-21756 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-21756?

CVE-2024-21756 affects Fortinet Fortisandbox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-21756?

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.

Does CVE-2024-21756 have an EU (EUVD) identifier?

Yes. CVE-2024-21756 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19370.

When was CVE-2024-21756 published?

CVE-2024-21756 was published on 2024-04-09 and last updated on 2026-06-17.

CVE-2024-21756

CVE-2024-21756 is a high-severity vulnerability in Fortinet Fortisandbox with a CVSS 3.x base score of 8.8. 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 8.8)
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-19370
Weakness: CWE-78
Affected product: Fortinet Fortisandbox
Published: 2024-04-09
Last modified: 2026-06-17

Description

A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 4.4.0 through 4.4.3, FortiSandbox 4.2.1 through 4.2.6, FortiSandbox 4.0.0 through 4.0.4 allows attacker to execute unauthorized code or commands via crafted requests..

Frequently asked questions

What is CVE-2024-21756?: A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 4.4.0 through 4.4.3, FortiSandbox 4.2.1 through 4.2.6, FortiSandbox 4.0.0 through 4.0.4 allows attacker to execute unauthorized code or commands via crafted requests..
How severe is CVE-2024-21756?: CVE-2024-21756 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2024-21756 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-21756?: CVE-2024-21756 affects Fortinet Fortisandbox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-21756?: 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.
Does CVE-2024-21756 have an EU (EUVD) identifier?: Yes. CVE-2024-21756 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-19370.
When was CVE-2024-21756 published?: CVE-2024-21756 was published on 2024-04-09 and last updated on 2026-06-17.

References

https://fortiguard.com/psirt/FG-IR-23-489

Affected products (1)

cpe:2.3:a:fortinet:fortisandbox:*:*:*:*:*:*:*:*

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