CVE-2024-21762 — Fortinet Fortios

As of 2025-10-24, CVE-2024-21762 is a CRITICAL-severity vulnerability in Fortinet Fortios, CVSS v3.1 9.8, EPSS 92.7% (99.7th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-02-09), with a US federal remediation deadline of 2024-02-16, and CISA links it to known ransomware campaigns. Threadlinqs Intelligence links 7 tracked threat campaigns to CVE-2024-21762, most recently “FortiBleed: Mass Credential Compromise Campaign Against Internet-Exposed Fortinet FortiGate Devices (86,644 Devices, 194 Countries)”.

Last updated: 2025-10-24

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 946 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)

92.7% probability of exploitation in the next 30 days, higher than 99.7% 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 2025-10-24

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. It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.

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

7 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.

• 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

Sources

Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

• fortiguard.com

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