Fortinet FortiOS up to 7.4.2 SSL-VPN out-of-bounds write

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.7$0-$5k0.09

Summaryinfo

A vulnerability described as very critical has been identified in Fortinet FortiOS up to 7.4.2. Impacted is an unknown function of the component SSL-VPN. Executing a manipulation can lead to out-of-bounds write. This vulnerability appears as CVE-2024-21762. The attack may be performed from remote. In addition, an exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Fortinet FortiOS up to 7.4.2 (Firewall Software). It has been declared as very critical. This vulnerability affects an unknown code block of the component SSL-VPN. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was presented 02/09/2024 as FG-IR-24-015. The advisory is available at fortiguard.com. This vulnerability was named CVE-2024-21762 since 01/02/2024. Technical details are unknown but a public exploit is available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 02/12/2026).

A public exploit has been developed by Carter in Python and been published 2 years after the advisory. It is possible to download the exploit at github.com. It is declared as attacked. As 0-day the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 236788 (Fortinet FortiOS and FortiProxy Remote Code Execution (CVE-2024-21762)), which helps to determine the existence of the flaw in a target environment. This issue was added on 02/09/2024 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 02/16/2024:

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Upgrading to version 6.2.16, 6.4.15, 7.0.14, 7.2.7 or 7.4.3 eliminates this vulnerability.

The vulnerability is also documented in the databases at Zero-Day.cz (860) and Tenable (236788). Additional details are provided at tenable.com. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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Vendor

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.7

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CNA Base Score: 9.8
CNA Vector (Fortinet, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Attacked
Author: Carter
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 236788
Nessus Name: Fortinet FortiOS and FortiProxy Remote Code Execution (CVE-2024-21762)

Zero-Day.cz: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Upgrade: FortiOS 6.2.16/6.4.15/7.0.14/7.2.7/7.4.3

Timelineinfo

01/02/2024 🔍
02/09/2024 +38 days 🔍
02/09/2024 +0 days 🔍
05/22/2025 +467 days 🔍
02/12/2026 +266 days 🔍

Sourcesinfo

Vendor: fortinet.com

Advisory: FG-IR-24-015
Status: Confirmed

CVE: CVE-2024-21762 (🔍)
GCVE (CVE): GCVE-0-2024-21762
GCVE (VulDB): GCVE-100-253258
scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍

Entryinfo

Created: 02/09/2024 03:51
Updated: 02/12/2026 14:14
Changes: 02/09/2024 03:51 (41), 02/09/2024 03:53 (1), 02/11/2024 13:36 (1), 03/02/2024 15:40 (1), 03/02/2024 15:46 (11), 04/30/2024 13:57 (23), 06/05/2024 06:38 (2), 09/09/2024 22:30 (2), 11/29/2024 20:43 (11), 05/17/2025 06:22 (2), 06/09/2025 16:55 (1), 02/12/2026 14:13 (5), 02/12/2026 14:14 (1)
Complete: 🔍
Committer: misc
Cache ID: 216:D90:103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

 Anonymous User (+1)
2 years ago
The CVE is known to be exploited and as been added to KEVC
https://www.cisa.gov/news-events/alerts/2024/02/09/cisa-adds-one-known-exploited-vulnerability-catalog
 shoper (+0)
2 years ago
Is there any exploit for this CVE?
 ElevatorCheck (+0)
2 years ago
also interesting

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