Is CVE-2024-21762 in the CISA KEV catalog?

Yes. CVE-2024-21762 is on the CISA Known Exploited Vulnerabilities list, added 2024-02-09, and has known ransomware campaign use.

What is the CVSS severity of CVE-2024-21762?

CVE-2024-21762 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2024-21762?

CVE-2024-21762 has an EPSS score of 83.43% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-21762?

Upgrade fortios to 7.4.3 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2024-21762

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

Description

A out-of-bounds write in Fortinet FortiOS versions 7.4.0 through 7.4.2, 7.2.0 through 7.2.6, 7.0.0 through 7.0.13, 6.4.0 through 6.4.14, 6.2.0 through 6.2.15, 6.0.0 through 6.0.17, FortiProxy versions 7.4.0 through 7.4.2, 7.2.0 through 7.2.8, 7.0.0 through 7.0.14, 2.0.0 through 2.0.13, 1.2.0 through 1.2.13, 1.1.0 through 1.1.6, 1.0.0 through 1.0.7 allows attacker to execute unauthorized code or commands via specifically crafted requests

CWE-787Out-of-bounds Write

How to fix

Remediation Available

fortiosNVD

Affected:>= 7.4.0, < 7.4.3Fixed in:7.4.3CVE-2024-21762derived from NVD

fortiproxyNVD

Affected:>= 7.4.0, < 7.4.3Fixed in:7.4.3CVE-2024-21762derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

83.43%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Fortinet FortiOS Out-of-Bound Write Vulnerability

Fortinet FortiOS contains an out-of-bound write vulnerability that allows a remote unauthenticated attacker to execute code or commands via specially crafted HTTP requests.

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Remediation due: 2024-02-16

Associated with ransomware campaigns

References

Vendor Advisory1

fortiguard.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-24.