CVE-2025-25255

Published Oct 14, 2025 CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed

Description

An Improperly Implemented Security Check for Standard vulnerability [CWE-358] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.11, FortiProxy 7.2 all versions, FortiProxy 7.0.1 through 7.0.22 may allow an unauthenticated proxy user to bypass the domain fronting protection feature via crafted HTTP requests.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Fortinet

FortiOS

unaffected

Version	Status	Constraints
`7.6.0`	affected	≤ 7.6.3

Fortinet

FortiProxy

unaffected

Version	Status	Constraints
`7.6.0`	affected	≤ 7.6.3
`7.4.0`	affected	≤ 7.4.11
`7.2.0`	affected	≤ 7.2.15
`7.0.1`	affected	≤ 7.0.22

Configuration 1 [-]

cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*

Configuration 2 [-]

cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*

No data.

No data available yet.

Remediation

Vendor Solution

Upgrade to FortiOS version 7.6.4 or above Upgrade to FortiProxy version 7.6.4 or above Upgrade to FortiProxy version 7.4.12 or above

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.437% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://fortiguard.fortinet.com/psirt/FG-IR-24-372

History

Jan 14, 2026 9:30 AM Description updated View changes

Type	Values Removed	Values Added
Description	An Improperly Implemented Security Check for Standard vulnerability [CWE-358] in Fortinet FortiOS 7.6.0 through 7.6.3, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.11, FortiProxy 7.2 all versions, FortiProxy 7.0.1 through 7.0.22 may allow an unauthenticated proxy user to bypass the domain fronting protection feature via crafted HTTP requests.	An Improperly Implemented Security Check for Standard vulnerability [CWE-358] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.11, FortiProxy 7.2 all versions, FortiProxy 7.0.1 through 7.0.22 may allow an unauthenticated proxy user to bypass the domain fronting protection feature via crafted HTTP requests.

Dec 9, 2025 5:45 PM Description updated. Affected versions updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description	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.	An Improperly Implemented Security Check for Standard vulnerability [CWE-358] in Fortinet FortiOS 7.6.0 through 7.6.3, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.11, FortiProxy 7.2 all versions, FortiProxy 7.0.1 through 7.0.22 may allow an unauthenticated proxy user to bypass the domain fronting protection feature via crafted HTTP requests.
CPEs		cpe:2.3:a:fortinet:fortiproxy:7.0.10:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.11:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.12:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.13:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.14:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.15:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.16:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.17:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.18:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.19:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.1:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.20:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.21:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.22:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.2:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.3:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.4:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.5:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.6:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.7:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.8:::::::* cpe:2.3:a:fortinet:fortiproxy:7.0.9:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.0:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.10:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.11:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.12:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.13:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.14:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.15:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.1:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.2:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.3:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.4:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.5:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.6:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.7:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.8:::::::* cpe:2.3:a:fortinet:fortiproxy:7.2.9:::::::* cpe:2.3:a:fortinet:fortiproxy:7.4.0:::::::* cpe:2.3:a:fortinet:fortiproxy:7.4.10:::::::* cpe:2.3:a:fortinet:fortiproxy:7.4.11:::::::* cpe:2.3:a:fortinet:fortiproxy:7.4.1:::::::* cpe:2.3:a:fortinet:fortiproxy:7.4.2:::::::* cpe:2.3:a:fortinet:fortiproxy:7.4.3:::::::* cpe:2.3:a:fortinet:fortiproxy:7.4.4:::::::* cpe:2.3:a:fortinet:fortiproxy:7.4.5:::::::* cpe:2.3:a:fortinet:fortiproxy:7.4.6:::::::* cpe:2.3:a:fortinet:fortiproxy:7.4.7:::::::* cpe:2.3:a:fortinet:fortiproxy:7.4.8:::::::* cpe:2.3:a:fortinet:fortiproxy:7.4.9:::::::* cpe:2.3:a:fortinet:fortiproxy:7.6.0:::::::* cpe:2.3:a:fortinet:fortiproxy:7.6.1:::::::* cpe:2.3:a:fortinet:fortiproxy:7.6.2:::::::* cpe:2.3:a:fortinet:fortiproxy:7.6.3:::::::*
Metrics	cvssV3_1 `{'score': 3.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C'}`	cvssV3_1 `{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C'}`

Oct 16, 2025 3:00 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Fortinet fortiproxy
CPEs		cpe:2.3:a:fortinet:fortiproxy:::::::: cpe:2.3:o:fortinet:fortios::::::::
Vendors & Products		Fortinet fortiproxy

Oct 16, 2025 1:00 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	cvssV3_1 `{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}`	cvssV3_1 `{'score': 3.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C'}`

Oct 15, 2025 2:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Oct 14, 2025 3:45 PM Description updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
Description		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.
First Time appeared		Fortinet Fortinet fortios
Weaknesses		CWE-358
CPEs		cpe:2.3:o:fortinet:fortios:7.6.0:::::::* cpe:2.3:o:fortinet:fortios:7.6.1:::::::* cpe:2.3:o:fortinet:fortios:7.6.2:::::::* cpe:2.3:o:fortinet:fortios:7.6.3:::::::*
Vendors & Products		Fortinet Fortinet fortios
References		https://fortiguard.fortinet.com/psirt/FG-IR-24-372