Vulnerability identifier: #VU83247

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-36641

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FortiOS
Operating systems & Components / Operating system
FortiProxy
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Fortinet, Inc

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error when processing HTTP headers in SSL VPN. A remote user can send a specially crafted HTTP request to the system and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FortiOS: 6.4.0 - 6.4.14, 7.0.0 - 7.0.12, 6.0.0 - 6.0.17, 6.2.0 - 6.2.15, 7.2.0 - 7.2.5, 7.4.0

FortiProxy: 2.0.0 - 2.0.13, 7.2.0 - 7.2.4, 7.0.0 - 7.0.10, 1.2.0 - 1.2.13, 1.1.0 - 1.1.6, 1.0.0 - 1.0.7

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External links
http://fortiguard.com/psirt/FG-IR-23-151

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.