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Fortinet Fortigate Domain fronting protection bypass in explicit web proxy (FG-IR-24-372)

medium Nessus Plugin ID 270406

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Synopsis

Fortinet Firewall is missing one or more security-related updates.

Description

The version of Fortigate installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the FG-IR-24-372 advisory.

 - An Improperly Implemented Security Check for Standard vulnerability [CWE-358] in FortiProxy 7.6.0 through 7.6.3, 7.4 all versions, 7.2 all versions, 7.0.1 through 7.0.21, and FortiOS 7.6.0 through 7.6.3 explicit web proxy may allow an authenticated proxy user to bypass the domain fronting protection feature via crafted HTTP requests. (CVE-2025-25255)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

For 7.6.x, upgrade to Fortigate version 7.6.4 or later.

See Also

https://www.fortiguard.com/psirt/FG-IR-24-372

Plugin Details

Severity: Medium

ID: 270406

File Name: fortigate_FG-IR-24-372.nasl

Version: 1.1

Type: local

Family: Firewalls

Published: 10/15/2025

Updated: 10/15/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:N

CVSS Score Source: CVE-2025-25255

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:fortinet:fortios

Required KB Items: Host/Fortigate/model, Host/Fortigate/version

Exploit Ease: No known exploits are available

Patch Publication Date: 10/14/2025

Vulnerability Publication Date: 10/14/2025

Reference Information

CVE: CVE-2025-25255