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Fortinet FortiOS / FortiProxy Authentication Bypass via WebSocket (CVE-2024-55591, CVE-2025-24472)

critical Nessus Plugin ID 324976

Synopsis

The remote Fortinet device is affected by a critical authentication bypass vulnerability.

Description

The instance of Fortinet FortiOS or FortiProxy running on the remote host is affected by an authentication bypass vulnerability (CWE-288) via crafted Node.js WebSocket requests or CSF proxy requests:

 - An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS 7.0.0 through 7.0.16 and FortiProxy 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module. (CVE-2024-55591)

 - An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS 7.0.0 through 7.0.16 and FortiProxy 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote attacker to gain super-admin privileges via crafted CSF proxy requests. (CVE-2025-24472)

Solution

Upgrade FortiOS to 7.0.17 or later, FortiProxy 7.0.x to 7.0.20 or later, or FortiProxy 7.2.x to 7.2.13 or later.
Alternatively, disable HTTP/HTTPS administrative interface or restrict access to trusted addresses via local-in policy.

See Also

https://fortiguard.fortinet.com/psirt/FG-IR-24-535

Plugin Details

Severity: Critical

ID: 324976

File Name: fortios_and_fortiproxy_CVE-2024-55591.nbin

Version: 1.2

Type: Remote

Family: CGI abuses

Published: 7/3/2026

Updated: 7/4/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.5

Percentile: 99.86

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.3

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

CVSS Score Source: CVE-2024-55591

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

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

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

Vulnerability Information

CPE: cpe:/a:fortinet:fortiproxy, cpe:/o:fortinet:fortios

Required KB Items: installed_sw/fortios_ui

Exploit Available: true

Exploit Ease: Exploits are available

Exploited by Nessus: true

Patch Publication Date: 1/14/2025

Vulnerability Publication Date: 1/14/2025

CISA Known Exploited Vulnerability Due Dates: 1/21/2025, 4/8/2025

Reference Information

CVE: CVE-2024-55591, CVE-2025-24472