---
title: "CVE-2024-21762: Fortinet FortiOS Out-of-Bound Write Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-21762/
description: "CVE-2024-21762 (Fortinet FortiOS): Exploited in the wild (CISA KEV). A out-of-bounds write in Fortinet FortiOS versions 7.4.0 through 7.4.2, 7.2.0 through…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-02-09
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-21762"
kev: true
cvss: 9.6
epss: 0.83428
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-21762: Fortinet FortiOS Out-of-Bound Write Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Fortinet FortiOS. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-02-09, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-02-16 ; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns .
- EPSS 83.4% , percentile 99.7: FIRST’s model estimates a 83.4% chance of exploitation activity in the next 30 days, higher than 99.7% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Editorial verdict: Act now. FortiOS SSL VPN Pre-Auth RCE (CVE-2024-21762) — Any FortiGate or FortiProxy with SSL VPN enabled on an unfixed build is exposed to unauthenticated remote code execution that has been exploited; upgrade or disable SSL VPN today.

## What it is

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

## Affected products (CVE record)

- Fortinet FortiProxy: 7.4.0 <= 7.4.2, 7.2.0 <= 7.2.8, 7.0.0 <= 7.0.14, 2.0.0 <= 2.0.13, 1.2.0 <= 1.2.13, 1.1.0 <= 1.1.6, 1.0.0 <= 1.0.7
- Fortinet FortiOS: 7.4.0 <= 7.4.2, 7.2.0 <= 7.2.6, 7.0.0 <= 7.0.13, 6.4.0 <= 6.4.14, 6.2.0 <= 6.2.15, 6.0.0 <= 6.0.17

## Severity

- fortinet CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:W/RC:C`

## Exploitation

- CISA KEV: added 2024-02-09; federal due date 2024-02-16. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 83.43% probability of exploitation activity in the next 30 days; percentile 99.7.

## Sources

- [Listed in CISA KEV notes (fortiguard.fortinet.com)](https://fortiguard.fortinet.com/psirt/FG-IR-24-015)
- [CVE.org record CVE-2024-21762](https://www.cve.org/CVERecord?id=CVE-2024-21762)
- [NVD entry CVE-2024-21762](https://nvd.nist.gov/vuln/detail/CVE-2024-21762)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-21762)
- [fortiguard.com](https://fortiguard.com/psirt/FG-IR-24-015)

---
Source page: https://erroneo.us/security/cve/CVE-2024-21762/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt