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CVE-2024-21762

Fortinet FortiOS Out-of-Bound Write

9.8 CRITICALActively exploited (CISA KEV)Used in ransomwareEPSS 83.4%
  1. Published9 Feb 2024
  2. Added to CISA KEV9 Feb 2024
  3. Remediation due16 Feb 2024
Actively exploited (CISA KEV)

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.

Added to KEV: 9 Feb 2024Federal remediation due: 16 Feb 2024Used in ransomware

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Fortinet FortiProxy≥ 1.0.0 < 2.0.14 · ≥ 7.0.0 < 7.0.15 · ≥ 7.2.0 < 7.2.9 · ≥ 7.4.0 < 7.4.3
Fortinet FortiOS≥ 6.0.0 < 6.0.18 · ≥ 6.2.0 < 6.2.16 · ≥ 6.4.0 < 6.4.15 · ≥ 7.0.0 < 7.0.14

Remediation

Fixed in
Fortinet FortiProxy≥ 2.0.14
Fortinet FortiOS≥ 6.0.18

References

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Frequently asked

Is CVE-2024-21762 being actively exploited?

Yes. CVE-2024-21762 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 9 Feb 2024. It has been used in ransomware campaigns.

How severe is CVE-2024-21762?

CVE-2024-21762 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 83.4% probability of exploitation.

Which products are affected by CVE-2024-21762?

Affected products include Fortinet FortiProxy, Fortinet FortiOS.

How do I fix CVE-2024-21762?

Upgrade affected software to a fixed version, for example Fortinet FortiProxy 2.0.14, Fortinet FortiOS 6.0.18 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2024-21762 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.