Vulnerability Snapshot
This advisory is rated CRITICAL — exploitation is trivial or already observed in the wild and impact is severe. Patch immediately, not on the next maintenance window.
Affected technology: FortiAnalyzer, FortiManager.
Executive Summary
CVSSv3 Score: 5.2 A use of potentially Dangerous Function vulnerability [CWE-676] in FortiAnalyzer and FortiManager API may allow an authenticated attacker to cause a system hang via multiple specially crafted HTTP requests causing crashes. This happens if internal locks are aligned, which is out of control of the attacker. Revised on 2026-05-12 00:00:00 ]]>
Source
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Affected Products
Sources
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Frequently Asked Questions
What is "DoS due to unsafe function in signal handler"?
This is a critical-severity vendor advisory from Fortinet PSIRT Advisories. It covers FortiAnalyzer, FortiManager and was flagged for security teams to evaluate.
Am I affected?
Check whether your environment runs FortiAnalyzer, FortiManager. If you operate any of those, treat yourself as in scope until you have evidence otherwise. A Vulnios scan will identify the exact assets carrying the affected version.
How urgent is the response?
Critical: do not wait for your normal patch cycle. Verify exposure today, apply the vendor patch immediately, and add detection rules for any post-exploit indicators.
How do I remediate?
Apply the vendor patch listed in the upstream advisory linked under Sources. If the patch is not yet available, follow the vendor-supplied workaround (often a config flag or feature disable) and add detections for the published exploit pattern in your SIEM. Re-scan after the patch lands to confirm the finding clears.
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