CVE-2024-21762
CriticalExploitedPublic exploitA 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…
Published Feb 16, 2024 · Updated Aug 4, 2026 · Also known as TR-24-0101
Key Facts
Patch immediately- CVE-2024-21762 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting FortiProxy (Fortinet), FortiOS (Fortinet).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 8, 2024 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 83% probability of exploitation in the next 30 days.
- Fixed versions are available, including FortiOS 6.0.18, FortiOS 6.2.16, FortiOS 6.4.15.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
83%
Higher than 99.6% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2024-21762 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Feb 9, 2024 | Feb 16, 2024 | Known |
| Industry KEV feed | Feb 8, 2024 | Feb 16, 2024 | Known |
| CIRCL KEV | Feb 9, 2024 | Feb 16, 2024 | Known |
| ENISA EUVD | Feb 9, 2024 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| FortiProxyFortinet | >= 7.4.0 | 2.0.14 |
| FortiOSFortinet | >= 7.4.0 | 6.0.18 |
Patched Releases
FortiOS
6.0.18, 6.2.16, 6.4.15, 7.0.14, 7.2.7, 7.4.3
FortiProxy
2.0.14, 7.0.15, 7.2.9, 7.4.3
Timeline
Added to Industry KEV feed
Feb 8, 2024
Added to CISA KEV
Feb 9, 2024
Added to CIRCL KEV
Feb 9, 2024
Added to ENISA EUVD
Feb 9, 2024
Publicly disclosed
Feb 16, 2024
Last updated
Aug 4, 2026
Weakness Type
- CWE-787 Out-of-bounds Write
References
- advisoryhttps://fortiguard.com/psirt/FG-IR-23-063
- advisoryhttps://fortiguard.com/psirt/FG-IR-23-268
- advisoryhttps://fortiguard.com/psirt/FG-IR-23-301
- advisoryhttps://fortiguard.com/psirt/FG-IR-23-357
- advisoryhttps://fortiguard.com/psirt/FG-IR-24-015
FAQ
Common Questions.
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 thro…
Affected: FortiProxy (Fortinet) versions >= 7.4.0; FortiOS (Fortinet) versions >= 7.4.0. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 8, 2024 and is known to be used in ransomware campaigns.
Yes. It was added on Feb 9, 2024 with a federal remediation due date of Feb 16, 2024.
Public exploit code is available.
Fixed versions are available, including FortiOS 6.0.18, FortiOS 6.2.16, FortiOS 6.4.15.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2024-21762 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo