What is CVE-2023-40718?

CVE-2023-40718 is a vulnerability in Fortinet IPS Engine versions 7.321, 7.166, and 6.158 that allows attackers to evade IPS features through crafted TCP packets.

How can an attacker exploit CVE-2023-40718?

An attacker can exploit CVE-2023-40718 by sending specially crafted TCP packets to evade IPS features.

Which versions of Fortinet IPS Engine are affected by CVE-2023-40718?

Fortinet IPS Engine versions 7.321, 7.166, and 6.158 are affected by CVE-2023-40718.

What is the severity of CVE-2023-40718?

CVE-2023-40718 has a severity rating of 7.5 (High).

Where can I find more information about CVE-2023-40718?

More information about CVE-2023-40718 can be found at https://fortiguard.com/psirt/FG-IR-23-090.

Vulnerability/
CVE-2023-40718

high

7.5

CWE

436

10/10/2023

13/10/2023

CVE-2023-40718: FortiOS - IPS Engine evasion using custom TCP flags

First published: Tue Oct 10 2023(Updated: )

A interpretation conflict in Fortinet IPS Engine versions 7.321, 7.166 and 6.158 allows attacker to evade IPS features via crafted TCP packets.

Credit: psirt@fortinet.com psirt@fortinet.com

Affected Software	Affected Version	How to fix
Fortinet Fortios Ips Engine	<=7.312
Fortinet FortiOS	>=7.2.0<7.2.4
Fortinet Fortios Ips Engine	<=7.165
Fortinet FortiOS	>=7.0.0<7.0.12
Fortinet Fortios Ips Engine	<=6.158
Fortinet FortiOS	>=6.4.0<6.4.13

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Reference Links

Frequently Asked Questions

What is CVE-2023-40718?
CVE-2023-40718 is a vulnerability in Fortinet IPS Engine versions 7.321, 7.166, and 6.158 that allows attackers to evade IPS features through crafted TCP packets.
How can an attacker exploit CVE-2023-40718?
An attacker can exploit CVE-2023-40718 by sending specially crafted TCP packets to evade IPS features.
Which versions of Fortinet IPS Engine are affected by CVE-2023-40718?
Fortinet IPS Engine versions 7.321, 7.166, and 6.158 are affected by CVE-2023-40718.
What is the severity of CVE-2023-40718?
CVE-2023-40718 has a severity rating of 7.5 (High).
Where can I find more information about CVE-2023-40718?
More information about CVE-2023-40718 can be found at https://fortiguard.com/psirt/FG-IR-23-090.

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alias/CVE-2023-40718
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agent/first-publish-date
collector/fortiguard-psirt
agent/title
agent/severity
agent/references
agent/description
agent/event
agent/tags
collector/nvd-api
agent/software-canonical-lookup-request
collector/nvd-index
vendor/fortinet
canonical/fortinet fortios ips engine
version/fortinet fortios ips engine/7.312
canonical/fortinet fortios
version/fortinet fortios/7.2.0
version/fortinet fortios ips engine/7.165
version/fortinet fortios/7.0.0
version/fortinet fortios ips engine/6.158
version/fortinet fortios/6.4.0

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