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Upgrade to ProDetect Fortinet FortiOS Sensitive Information Exposure (CVE-2025-68686) in Google Chronicle
CVE-2025-68686 is an Exposure of Sensitive Information to an Unauthorized Actor vulnerability (CWE-200) in Fortinet FortiOS, added to CISA's Known Exploited Vulnerabilities catalog. Unauthorized actors may be able to access sensitive information exposed by affected FortiOS instances, potentially including configuration data, credentials, session tokens, or internal system details that could facilitate further compromise. This detection focuses on identifying anomalous access to FortiOS management interfaces, unusual API/CLI enumeration behavior, and downstream indicators of information disclosure abuse such as suspicious authentication following reconnaissance against exposed FortiOS endpoints.
MITRE ATT&CK
YARA-L Detection Query
rule fortios_sensitive_info_exposure_cve_2025_68686 {
meta:
author = "detection-engineering"
description = "Detects anomalous FortiOS management access consistent with CVE-2025-68686 exploitation"
severity = "HIGH"
events:
$e.metadata.event_type = "NETWORK_HTTP"
$e.target.hostname = /(?i)fortigate|fortios/
$e.network.http.method = "GET" or $e.network.http.method = "POST"
$e.target.url = /(?i)(api|cmdb|cgi-bin)/
$e.network.http.response_code = 200
match:
$src_ip over 1h
condition:
$e and #e > 20
}Chronicle YARA-L rule detecting repeated successful access to FortiOS API/CMDB endpoints from a single source, indicating possible information disclosure exploitation of CVE-2025-68686.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate high-frequency API polling by management tools
- Authorized security assessments
- Bulk configuration retrieval by administrators
Other platforms for CVE-2025-68686
Testing Methodology
Validate this detection against 3 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Simulate high-volume FortiOS admin API access
Expected signal: Multiple HTTP GET requests to /api/v2/cmdb/* endpoint from a single source IP within a short time window, logged in firewall/proxy logs.
- Test 2Simulate FortiOS config backup enumeration
Expected signal: Repeated backup/config-related HTTP requests logged in FortiOS event logs and network proxy logs.
- Test 3Simulate SSL-VPN portal session enumeration
Expected signal: Multiple failed/attempted SSL-VPN login events logged with consistent source IP within a short window.
References (4)
- https://fortiguard.fortinet.com/psirt/FG-IR-25-934
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- https://nvd.nist.gov/vuln/detail/CVE-2025-68686
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