CVE-2025-58413
📋 TL;DR
A stack-based buffer overflow vulnerability in Fortinet FortiOS and FortiSASE allows attackers to execute arbitrary code via specially crafted packets. This affects multiple FortiOS versions from 6.0 through 7.6.3 and FortiSASE 25.3.b. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- Fortinet FortiOS
- Fortinet FortiSASE
📦 What is this software?
Fortios by Fortinet
Fortios by Fortinet
Fortisase by Fortinet
Fortisase by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with root/admin privileges, enabling persistent access, data exfiltration, and lateral movement within the network.
Likely Case
Remote code execution leading to service disruption, credential theft, and installation of backdoors or malware.
If Mitigated
Limited impact with proper network segmentation, intrusion prevention systems, and strict access controls in place.
🎯 Exploit Status
Exploitation requires crafting specific network packets but does not require authentication. No public proof-of-concept is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FortiOS 7.6.4, 7.4.9, and later versions; FortiSASE 25.4 and later
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-25-632
Restart Required: Yes
Instructions:
1. Review the Fortinet advisory for specific patching instructions. 2. Download the appropriate firmware update from the Fortinet support portal. 3. Apply the update following Fortinet's upgrade procedures. 4. Reboot the device to complete the installation.
🔧 Temporary Workarounds
Network Segmentation and Access Control
allRestrict network access to Fortinet devices to only trusted sources using firewall rules and network segmentation.
Intrusion Prevention System Rules
allDeploy IPS signatures to detect and block exploitation attempts targeting this vulnerability.
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure to only necessary trusted IP addresses.
- Enable logging and monitoring for suspicious network traffic patterns and failed exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Check the FortiOS version via the web interface (System > Dashboard) or CLI command 'get system status'. Compare against affected version ranges.Check Version:
execute 'get system status' in FortiOS CLIVerify Fix Applied:
Verify the firmware version has been updated to a patched version (7.6.4+, 7.4.9+, or later applicable versions).📡 Detection & Monitoring
Log Indicators:
- Unusual network traffic patterns, failed exploitation attempts in system logs, unexpected process execution
Network Indicators:
- Suspicious packet patterns targeting Fortinet devices, anomalous traffic to management interfaces
SIEM Query:
source_ip IN (suspicious_ips) AND dest_port IN (fortinet_ports) AND protocol=tcp/udp AND packet_size > threshold