CVE-2024-21762

CRITICAL KEV RANSOMWARE

FortiOS/FortiProxy Out-of-bounds Write Vulnerability

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2024-21762 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added February 9, 2024, with confirmed use in ransomware campaigns. EIP tracks 11 public exploits from researchers including h4x0r-dz, BishopFox, r4p3c4.

AI-analyzed exploit summary This repository contains a functional exploit PoC for CVE-2024-21762, an out-of-bounds write vulnerability in Fortinet FortiOS SSL VPN. The exploit leverages a stack-based buffer overflow via crafted HTTP chunked encoding to achieve remote code execution (RCE) through a ROP chain.

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

Exploits (11)

nomisec WORKING POC 145 stars
by h4x0r-dz · dos
https://github.com/h4x0r-dz/CVE-2024-21762

This repository contains a functional exploit PoC for CVE-2024-21762, an out-of-bounds write vulnerability in Fortinet FortiOS SSL VPN. The exploit leverages a stack-based buffer overflow via crafted HTTP chunked encoding to achieve remote code execution (RCE) through a ROP chain.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: Fortinet FortiOS (7.4.2 and earlier)
No auth needed
Prerequisites: Network access to vulnerable FortiOS SSL VPN interface · Python environment to run the PoC
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec SCANNER 106 stars
by BishopFox · infoleak
https://github.com/BishopFox/cve-2024-21762-check

This repository contains a Python script that checks whether a FortiGate SSL VPN is vulnerable to CVE-2024-21762 by sending crafted HTTP requests and analyzing the response. It does not exploit the vulnerability but safely detects its presence.

Classification
Scanner 100%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: FortiGate SSL VPN (FortiOS)
No auth needed
Prerequisites: Network access to the target SSL VPN interface
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec SCANNER 15 stars
by r4p3c4 · infoleak
https://github.com/r4p3c4/CVE-2024-21762-Exploit-PoC-Fortinet-SSL-VPN-Check

The repository contains Python scripts that check for the presence of CVE-2024-21762 in Fortinet SSL VPN interfaces by sending crafted HTTP requests and analyzing responses. It does not include exploit code for achieving RCE but detects vulnerability status.

Classification
Scanner 95%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: Fortinet SSL VPN
No auth needed
Prerequisites: Network access to target Fortinet SSL VPN interface
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WORKING POC 13 stars
by d0rb · remote
https://github.com/d0rb/CVE-2024-21762

The repository contains a functional Python exploit for CVE-2024-21762, targeting a remote code execution vulnerability in FortiGate. The exploit crafts a malicious HTTP request with a ROP chain and payload to achieve arbitrary code execution.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: FortiGate (version not specified)
No auth needed
Prerequisites: Network access to the target FortiGate device · Python environment to run the exploit
devstral-2 · analyzed Feb 18, 2026 Full analysis →
github SCANNER 2 stars
by adminlove520 · pythonpoc
https://github.com/adminlove520/CVE-Poc_All_in_One/tree/main/2024/CVE-2024-21762

The repository contains a scanner for CVE-2024-21762, a Fortinet SSL VPN vulnerability, which checks if a target host is vulnerable by sending crafted HTTP requests. It does not include exploit code for achieving RCE but verifies the presence of the vulnerability.

Classification
Scanner 90%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: Fortinet SSL VPN
No auth needed
Prerequisites: Network access to the target host · SSL/TLS connectivity to the target port
devstral-2 · analyzed Feb 27, 2026 Full analysis →
nomisec WORKING POC 1 stars
by abrewer251 · remote
https://github.com/abrewer251/CVE-2024-21762_FortiNet_PoC

This repository contains a functional proof-of-concept exploit for CVE-2024-21762, targeting a stack-based buffer overflow or command injection vulnerability in FortiOS SSL VPN's /remote/hostcheck_validate endpoint. The exploit includes a reverse shell payload delivery mechanism and a C2 server for post-exploitation command execution.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: FortiOS SSL VPN
No auth needed
Prerequisites: Network access to the FortiOS SSL VPN interface · Knowledge of the target IP and port
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec SCANNER 1 stars
by rdoix · infoleak
https://github.com/rdoix/cve-2024-21762-checker

This repository contains a Python script that scans for CVE-2024-21762 by leveraging the Shodan API to identify FortiGate SSL VPN instances and then checks their vulnerability status via crafted HTTP requests. It does not exploit the vulnerability but detects its presence.

Classification
Scanner 95%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: FortiGate SSL VPN (versions affected by CVE-2024-21762)
No auth needed
Prerequisites: Shodan API key · Internet access · Python 3.x
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WORKING POC
by 0x0asif · poc
https://github.com/0x0asif/CVE-2024-21762

This repository contains a functional exploit for CVE-2024-21762, targeting a Fortinet SSL VPN vulnerability. The exploit sends a crafted POST request to the '/remote/hostcheck_validate' endpoint with a reverse shell payload, demonstrating remote code execution (RCE).

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Fortinet SSL VPN (likely FortiOS)
No auth needed
Prerequisites: Network access to the target · Callback listener setup
devstral-2 · analyzed Mar 13, 2026 Full analysis →
nomisec WORKING POC
by 0x13-ByteZer0 · remote
https://github.com/0x13-ByteZer0/CVE-2024-21762

This repository contains a functional exploit for CVE-2024-21762, targeting an out-of-bounds write vulnerability in FortiGate SSL VPN (FortiOS). The exploit includes ROP gadgets, heap spraying techniques, and a reverse shell payload for remote code execution.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: FortiOS SSL VPN (FortiGate)
No auth needed
Prerequisites: Network access to the target FortiGate SSL VPN service · Knowledge of target FortiOS version for ROP gadgets
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec WORKING POC
by CrackerCat · poc
https://github.com/CrackerCat/cve-2024-21762-poc

This repository contains a functional exploit PoC for CVE-2024-21762, a critical out-of-bounds write vulnerability in Fortinet FortiOS and FortiProxy SSL VPN components. The exploit leverages a crafted HTTP request to trigger a stack-based buffer overflow, leading to remote code execution (RCE) via ROP chain manipulation.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: Fortinet FortiOS and FortiProxy (SSL VPN component)
No auth needed
Prerequisites: Network access to the target FortiOS/FortiProxy SSL VPN interface · Target system running a vulnerable version of FortiOS/FortiProxy
devstral-2 · analyzed Feb 19, 2026 Full analysis →
nomisec SCANNER
by deFr0ggy · poc
https://github.com/deFr0ggy/CVE-2024-21762-Checker

This repository contains a Python script that scans for CVE-2024-21762, a Fortinet SSL VPN vulnerability, by sending crafted HTTP requests and analyzing responses to determine if a target is vulnerable or patched. It does not exploit the vulnerability but detects its presence.

Classification
Scanner 95%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: Fortinet FortiOS SSL VPN (versions 6.0 to 7.4.2)
No auth needed
Prerequisites: Network access to the target Fortinet SSL VPN interface
devstral-2 · analyzed Feb 18, 2026 Full analysis →

Scores

CVSS v3 9.8
EPSS 0.9264
EPSS Percentile 99.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation active
Automatable yes
Technical Impact total

Details

CISA KEV 2024-02-09
VulnCheck KEV 2024-02-08
InTheWild.io 2024-02-09
ENISA EUVD EUVD-2024-19376
Ransomware Use Confirmed
CWE
CWE-787
Status published
Products (2)
fortinet/fortios 6.0.0 - 6.0.18
fortinet/fortiproxy 1.0.0 - 2.0.14
Published Feb 09, 2024
KEV Added Feb 09, 2024
Tracked Since Feb 18, 2026