CVE-2025-47294
📋 TL;DR
An integer overflow vulnerability in Fortinet FortiOS allows remote unauthenticated attackers to crash the csfd daemon via specially crafted requests. This affects FortiOS versions 7.2.0-7.2.7 and 7.0.0-7.0.14. The vulnerability can cause denial of service but does not allow code execution or privilege escalation.
💻 Affected Systems
- Fortinet FortiOS
📦 What is this software?
Fortios by Fortinet
Fortios by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Remote unauthenticated attacker causes repeated csfd daemon crashes leading to sustained denial of service, potentially disrupting security services and network operations.
Likely Case
Remote attacker causes temporary service disruption by crashing the csfd daemon, requiring manual intervention or automatic restart.
If Mitigated
With proper network segmentation and access controls, only authorized internal systems can reach vulnerable interfaces, limiting attack surface.
🎯 Exploit Status
Remote unauthenticated exploitation with low complexity makes this attractive for attackers. No public exploit code is known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FortiOS 7.2.8 or later, FortiOS 7.0.15 or later
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-24-388
Restart Required: Yes
Instructions:
1. Download FortiOS 7.2.8+ or 7.0.15+ from Fortinet support portal. 2. Backup current configuration. 3. Apply firmware update via GUI or CLI. 4. Reboot device. 5. Verify successful upgrade.
🔧 Temporary Workarounds
Restrict network access to management interfaces
allLimit access to FortiOS management interfaces to trusted IP addresses only
config system interface
edit <interface_name>
set allowaccess https ssh ping
set trust-ip-1 <trusted_ip>
end
Enable rate limiting
allConfigure rate limiting on management interfaces to limit request frequency
config system global
set admin-lockout-threshold 10
set admin-lockout-duration 300
end
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FortiOS devices from untrusted networks
- Deploy network-based IPS/IDS with signatures for FortiOS DoS attacks
🔍 How to Verify
Check if Vulnerable:
Check FortiOS version via CLI: get system status | grep Version. If version is 7.2.0-7.2.7 or 7.0.0-7.0.14, device is vulnerable.Check Version:
get system status | grep VersionVerify Fix Applied:
After patching, verify version is 7.2.8+ or 7.0.15+ using: get system status | grep Version📡 Detection & Monitoring
Log Indicators:
- csfd daemon crash logs
- unexpected service restarts
- high frequency of requests to management interfaces
Network Indicators:
- Unusual traffic patterns to FortiOS management ports
- Multiple malformed requests from single source
SIEM Query:
source="fortigate" AND (event="csfd_crash" OR event="service_restart")