What is CVE-2024-21762?
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
The record classifies CVE-2024-21762 under weakness class CWE-787. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 992 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 83.4% probability of exploitation in the next 30 days, higher than 99.6% of all scored CVEs
- CISA KEV
- Listed since 2024-02-09, federal remediation deadline 2024-02-16 — used in known ransomware campaigns
- Threadlinqs priority
- 10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
- Published
- 2024-02-09, last modified 2026-08-04
Is CVE-2024-21762 being exploited?
CISA added CVE-2024-21762 to the Known Exploited Vulnerabilities catalog on 2024-02-09, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2024-02-16 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2024-21762 is publicly available. 11 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 53 in the Threadlinqs vulnerability feed.
- h4x0r-dz/CVE-2024-21762 (github)
- BishopFox/cve-2024-21762-check (github)
- r4p3c4/CVE-2024-21762-Exploit-PoC-Fortinet-SSL-VPN-Check (github)
- d0rb/CVE-2024-21762 (github)
- abrewer251/CVE-2024-21762_FortiNet_PoC (github)
- rdoix/cve-2024-21762-checker (github)
- abraxas/Fortigate-SSL-VPN-Exploit-Kit (github)
- deFr0ggy/CVE-2024-21762-Checker (github)
Affected products and versions
- Fortinet: Fortios, Fortiproxy
How to fix CVE-2024-21762
The record marks a vendor fix as available for CVE-2024-21762. Vendor advisory: https://fortiguard.com/psirt/FG-IR-24-015. Because CVE-2024-21762 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2024-02-16. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2024-21762
12 tracked threats in the Threadlinqs corpus reference CVE-2024-21762, either in the campaign’s CVE list or as an indicator on the campaign record.
- Operation Escaneo: MexicanMafia (PanchoVilla) Intrusion Campaign Against Mexican Government Agencies and Latin American Financial Institutions — HIGH · 2026-10-23
- Qilin Ransomware Suspect Arrested in Japan, Extradited to Germany; Qilin Affiliate Exploited Check Point VPN Zero-Day CVE-2026-50751 — HIGH · 2026-10-07
- Attacker Maintains Root-Level MeshCentral Backdoor Inside Thai ISP 3BB, Targets RADIUS Subscriber-Credential Databases (CVE-2024-21762 Toolkit Staged) — HIGH · 2026-09-15
- CISA Adds Two Known Exploited Vulnerabilities to Catalog: Fortinet FortiOS Information Disclosure (CVE-2025-68686) and Arista VeloCloud Orchestrator OS Command Injection (CVE-2026-16812) — CRITICAL · 2026-07-27
- FortiBleed: Mass Credential Compromise Campaign Against Internet-Exposed Fortinet FortiGate Devices (86,644 Devices, 194 Countries) — CRITICAL · 2026-07-11
- StrikeShark Campaign: SharkLoader Dropper Targets Governments and Software Developers via N-Day Exploits and Trojanized Installers to Deploy Cobalt Strike — HIGH · 2026-07-11
- FortiBleed Credential Theft Campaign Linked to INC and Lynx Ransomware Operations — CRITICAL · 2026-07-05
- SharkLoader Malware Campaign Uses Fake Cisco AnyConnect and Google Update Installers to Deploy Cobalt Strike — HIGH · 2026-07-03
- FortiBleed Credential Theft Campaign: FortigateSniffer Tool Deployed Against 430,000+ FortiGate Firewalls, Linked to INC Ransom and Lynx Ransomware — CRITICAL · 2026-07-01
- SharkLoader Malware Deploys Cobalt Strike Beacon via DLL Side-Loading in StrikeShark Campaign — HIGH · 2026-06-27
- Kyber Ransomware: Post-Quantum Hybrid Encryption Operation Targeting Windows & VMware ESXi — CRITICAL · 2026-04-22
- Payouts King Ransomware Uses QEMU Virtual Machines to Bypass EDR and Endpoint Security Controls — HIGH · 2026-04-19
Sources
Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .