CVE-2025-24477
📋 TL;DR
A heap-based buffer overflow vulnerability in Fortinet FortiOS allows authenticated attackers to escalate privileges via specially crafted CLI commands. This affects FortiOS versions 7.6.0-7.6.2, 7.4.0-7.4.7, and 7.2.4-7.2.12. Organizations using these vulnerable FortiOS versions are at risk of privilege escalation attacks.
💻 Affected Systems
- Fortinet FortiOS
📦 What is this software?
Fortios by Fortinet
Fortios by Fortinet
Fortios by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker gains administrative privileges, enabling complete system compromise, data exfiltration, and persistent backdoor installation.
Likely Case
An authenticated user with limited privileges escalates to administrative access, potentially modifying configurations, accessing sensitive data, or disabling security controls.
If Mitigated
With proper access controls and monitoring, impact is limited to isolated privilege escalation attempts that are detected and contained.
🎯 Exploit Status
Exploitation requires authenticated CLI access; buffer overflow via crafted commands suggests moderate technical complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FortiOS 7.6.3, 7.4.8, 7.2.13 or later
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-25-026
Restart Required: Yes
Instructions:
1. Download appropriate firmware from Fortinet support portal. 2. Backup current configuration. 3. Upload and install firmware update via GUI or CLI. 4. Reboot device after installation. 5. Verify successful upgrade and restore functionality.
🔧 Temporary Workarounds
Restrict CLI Access
allLimit CLI access to trusted administrators only using role-based access controls.
config system admin
edit <username>
set accprofile "prof_admin"
end
Enable Command Logging
allEnable comprehensive CLI command logging to detect exploitation attempts.
config log setting
set cli-audit-log enable
end
🧯 If You Can't Patch
- Implement strict access controls to limit CLI access to essential administrators only.
- Enable detailed auditing and monitoring of CLI commands for suspicious activity.
🔍 How to Verify
Check if Vulnerable:
Check FortiOS version via CLI: 'get system status' or GUI: System > Dashboard. Compare against affected versions.Check Version:
get system status | grep VersionVerify Fix Applied:
Verify version is 7.6.3+, 7.4.8+, or 7.2.13+ using 'get system status' command.📡 Detection & Monitoring
Log Indicators:
- Unusual CLI command patterns
- Multiple failed privilege escalation attempts
- Administrative account creation/modification
Network Indicators:
- Unexpected configuration changes
- Unauthorized administrative access patterns
SIEM Query:
source="fortigate" AND (event_type="cli" AND command="*admin*" OR command="*config*" OR command="*system*")