Fortinet FortiOS & FortiProxy Security Fabric (CSF) Authentication Bypass to Super-Admin Privilege Escalation (CVE-2025-24472)
Executive & SecOps Summary
SECOPS ASSESSMENTFortiOS versions 7.0.0 through 7.0.16, and FortiProxy versions 7.0.0 through 7.0.19, 7.2.0 through 7.2.12, with Security Fabric (CSF) enabled
A remote unauthenticated attacker with knowledge of upstream and downstream device serial numbers can bypass authentication via crafted CSF proxy requests to gain full super-admin privileges on the downstream device
Immediately upgrade FortiOS and FortiProxy to the patched versions, or disable the Security Fabric feature and restrict access to the CSF port as a temporary workaround
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Administrators should immediately upgrade FortiOS and FortiProxy to the designated patched versions. Below are the CLI commands to verify the status and perform a firmware restoration/upgrade.
# Check current system version and Security Fabric status
get system status
show system csf
# Upgrade firmware via TFTP server (Ensure a maintenance window is scheduled)
execute restore image tftp FOS_v7.0.17_buildXXXX.out 192.168.1.1002. Temporary Workaround & Hardening Configuration
If an immediate upgrade is not feasible, disable the Security Fabric (CSF) feature entirely or restrict access to the CSF port (TCP 8013) using local-in policies.
# Disable Security Fabric (CSF) to mitigate the attack vector
config system csf
set status disable
end
# Restrict inbound access to CSF port 8013 to trusted management IPs only
config firewall local-in-policy
edit 100
set dport 8013
set protocol 6
set srcaddr 'TRUSTED_MANAGEMENT_IPS'
set dstaddr 'all'
set action accept
next
edit 101
set dport 8013
set protocol 6
set srcaddr 'all'
set dstaddr 'all'
set action deny
next
end3. Log Audit & IoC Verification Commands
Inspect system logs for unauthorized CSF-related activities and monitor active sessions on the CSF port to detect potential exploitation attempts.
# Filter and display system logs related to CSF and admin logins
show log syslog filter category 1
execute log filter category system
execute log filter field message 'CSF'
execute log display
# Monitor active connections on the CSF port (TCP 8013)
diagnose sys session filter dport 8013
diagnose sys session listStop Exposing VPN Ports to the Internet — Switch to Zero-Trust Access
Eliminate public-facing VPN concentrators and firewall management ports with identity-first Zero-Trust Network Access.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2025-24472) is an Authentication Bypass Using an Alternate Path or Channel [CWE-288] within the Cooperative Security Fabric (CSF) protocol of Fortinet FortiOS and FortiProxy. The root cause lies in the insufficient validation of trust relationships during CSF proxy request processing. When the Security Fabric is enabled, the downstream device relies heavily on the serial numbers of the participating fabric devices to authenticate administrative requests. This design flaw allows an attacker who possesses the serial numbers of both upstream and downstream devices to forge legitimate-looking CSF proxy requests, bypassing standard authentication barriers.
2. Exploitation Mechanics & Attack Scenario
To execute this attack, an unauthenticated remote adversary must first obtain the serial numbers of the target's upstream and downstream Fortinet devices. Once these identifiers are acquired, the attacker crafts malicious CSF proxy requests targeting the CSF communication port (typically TCP port 8013) on the downstream device. Because the downstream device's authentication logic incorrectly assumes that any request containing valid, matching serial numbers originates from a trusted upstream peer, it processes the request without demanding administrative credentials. This grants the attacker an active, unauthorized session with super-admin privileges directly on the downstream device.
3. Infrastructure & Business Impact
With a CVSS score of 8.1 (High) and its inclusion in the CISA Known Exploited Vulnerabilities (KEV) catalog, this vulnerability poses an immediate and severe threat to enterprise networks. Successful exploitation grants the attacker absolute control (Super-Admin) over the affected firewall or proxy gateway. This allows adversaries to manipulate firewall policies, intercept or redirect network traffic, extract sensitive configuration data, compromise VPN tunnels, and pivot deeper into the internal corporate network, leading to catastrophic data breaches and operational downtime.
Official Vendor Advisories & References
An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS 7.0.0 through 7.0.16 and FortiProxy 7.2.0 through 7.2.12, 7.0.0 through 7.0.19 may allow a remote unauthenticated attacker with prior knowledge of upstream and downstream devices serial numbers to gain super-admin privileges on the downstream device, if the Security Fabric is enabled, via crafted CSF proxy requests.
Frequently Asked SecOps Questions (CVE-2025-24472)
FAQQ1. How critical is CVE-2025-24472 and is it actively exploited in the wild?
CVE-2025-24472 is rated CVSS 8.1 (HIGH) with a 30-day EPSS exploitation probability of 7.2%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2025-24472?
Primary impacted vendors include fortinet across fortios, fortiproxy. Scope summary: FortiOS 7.0.0 through 7.0.16 (Fixed in 7.0.17 and later) / FortiProxy 7.2.0 through 7.2.12 (Fixed in 7.2.13), 7.0.0 through 7.0.19 (Fixed in 7.0.20)
Q3. What temporary mitigations or workarounds exist for CVE-2025-24472 before patching?
[Mitigation] Immediately upgrade FortiOS and FortiProxy to the patched versions, or disable the Security Fabric feature and restrict access to the CSF port as a temporary workaround Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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