CVE-2025-25250
📋 TL;DR
This vulnerability allows authenticated SSL-VPN users to access full SSL-VPN configuration settings through specially crafted URLs. It affects FortiOS versions 7.6.0, 7.4.7 and below, 7.2.x, 7.0.x, and 6.4.x when using SSL-VPN web-mode.
💻 Affected Systems
- FortiOS
📦 What is this software?
Fortios by Fortinet
Fortios by Fortinet
Fortisase by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Authenticated attackers could obtain sensitive SSL-VPN configuration details, potentially enabling further attacks or reconnaissance.
Likely Case
Authorized users gaining unauthorized access to SSL-VPN settings they shouldn't see.
If Mitigated
Limited information exposure with no direct system compromise.
🎯 Exploit Status
Requires authenticated SSL-VPN access and knowledge of URL crafting
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.6.1, 7.4.8, and later versions
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-24-257
Restart Required: Yes
Instructions:
1. Access FortiGate web interface 2. Navigate to System > Firmware 3. Upload and install patched firmware 4. Reboot device after installation
🔧 Temporary Workarounds
Disable SSL-VPN web-mode
allTemporarily disable SSL-VPN web-mode if not required
config vpn ssl settings
set web-mode disable
end
Restrict SSL-VPN user permissions
allApply strict access controls to SSL-VPN users
config user local
edit <username>
set type password
set sslvpn-access enable
set sslvpn-permission <restrictive-profile>
end
🧯 If You Can't Patch
- Implement network segmentation to isolate SSL-VPN traffic
- Enable detailed logging and monitoring of SSL-VPN access patterns
🔍 How to Verify
Check if Vulnerable:
Check FortiOS version and SSL-VPN web-mode configurationCheck Version:
get system status | grep VersionVerify Fix Applied:
Verify installed firmware version is 7.6.1, 7.4.8 or later📡 Detection & Monitoring
Log Indicators:
- Unusual SSL-VPN configuration access patterns
- Multiple failed attempts to access restricted URLs
Network Indicators:
- Abnormal SSL-VPN traffic patterns
- Repeated requests to SSL-VPN configuration endpoints
SIEM Query:
source="fortigate" AND "sslvpn" AND ("config" OR "setting") AND status=200