CVE-2025-25255

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.

CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness Type (CWE)

CWE-358 CWE-358

Affected Products

Vendor	Product	Versions
fortinet	fortiproxy	7.0.1 — 7.6.4
fortinet	fortios	7.6.0 — 7.6.4

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2025-25255? +

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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-25255? +

CVE-2025-25255 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-25255? +

CVE-2025-25255 affects products from fortinet, specifically: fortios, fortiproxy. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-25255? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-40597

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.28.1 and below, given any pre-existing XSS / …

CVE-2026-48797

Backpropagate is a Python library for fine-tuning large language models on a single GPU. In versions 1.1.0 and 1.1.1, the …

CVE-2024-12056

The Client secret is not checked when using the OAuth Password grant type. By exploiting this vulnerability, an attacker could …

CVE-2026-54431

In liboauth2 the Demonstrating Proof-of-Possession (DPoP) verifier accepts a proof whose JSON Web Key (jwk) header contains private key material. …

CVE-2026-12577

DVP80ES3 with Improperly Implemented Security Check for Standard vulnerability.

CVE-2025-62583 9.8

Whale Browser before 4.33.325.17 allows an attacker to escape the iframe sandbox in a dual-tab environment.