CVE-2023-45586

Severity: medium (CVSS 5.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-14 · updated 2026-06-17
Weakness: CWE-345

Description

An insufficient verification of data authenticity vulnerability [CWE-345] in Fortinet FortiOS SSL-VPN tunnel mode version 7.4.0 through 7.4.1, version 7.2.0 through 7.2.7 and before 7.0.12 & FortiProxy SSL-VPN tunnel mode version 7.4.0 through 7.4.1, version 7.2.0 through 7.2.7 and before 7.0.13 allows an authenticated VPN user to send (but not receive) packets spoofing the IP of another user via crafted network packets.

Affected products

Fortinet FortiOS (FortiGate): from 6.2.0 through 6.2.16; from 6.4.0 through 6.4.15; from 7.0.0 before 7.0.13; from 7.2.0 before 7.2.8; 7.4.0, 7.4.1 — fixed in 7.0.13, 7.2.8
Fortinet FortiProxy: from 2.0.0 through 2.0.12; from 7.0.0 before 7.0.14; from 7.2.0 before 7.2.8; 7.4.0, 7.4.1 — fixed in 7.0.14, 7.2.8

How to fix

Upgrade to a fixed version: Fortinet FortiOS (FortiGate) 7.0.13, 7.2.8; Fortinet FortiProxy 7.0.14, 7.2.8. Check the vendor advisory for mitigations.

References

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