CVE-2026-25815
📋 TL;DR
This vulnerability allows attackers to decrypt LDAP credentials stored in FortiOS configuration files due to a static encryption key shared across all customer installations. All FortiOS users with LDAP authentication configured are affected unless they've enabled a specific non-default option. The vendor disputes this is a vulnerability, arguing customers should enable the non-default option.
💻 Affected Systems
- Fortinet FortiOS
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain access to LDAP credentials, potentially compromising entire directory services and enabling lateral movement across networks.
Likely Case
Attackers decrypt stored LDAP passwords, gaining unauthorized access to systems using those credentials for authentication.
If Mitigated
With proper controls, impact is limited to configuration file access only, with no credential decryption possible.
🎯 Exploit Status
Actively exploited in the wild since December 2025. Attackers need access to configuration files to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch available. Vendor recommends enabling private data encryption feature as workaround.
🔧 Temporary Workarounds
Enable Private Data Encryption
allEnable the non-default private data encryption feature to use unique encryption keys per installation
config system global
set private-data-encryption enable
end
🧯 If You Can't Patch
- Restrict access to FortiOS configuration files to authorized administrators only
- Monitor for unauthorized access attempts to configuration files and review LDAP authentication logs
🔍 How to Verify
Check if Vulnerable:
Check if private-data-encryption is disabled: 'show system global | grep private-data-encryption'Check Version:
get system status | grep VersionVerify Fix Applied:
Verify private-data-encryption is enabled: 'show system global | grep private-data-encryption' should return 'enable'📡 Detection & Monitoring
Log Indicators:
- Unauthorized access to configuration files
- Failed LDAP authentication attempts from unusual sources
- Configuration file modification events
Network Indicators:
- Unusual outbound connections from FortiGate devices
- LDAP traffic from unexpected sources
SIEM Query:
source="fortigate" AND (event_type="config-change" OR event_type="file-access") AND target_file="*config*"