Early Warning Signals: When Attacker Behavior Precedes New Vulnerabilities

A Data-Driven Look at Early Warning Signals 

What if attackers are tipping their hand weeks before a vulnerability is even disclosed? 

GreyNoise’s new research reveals a recurring pattern: spikes in malicious activity often precede the disclosure of new CVEs — especially in enterprise edge technologies like VPNs and firewalls. In 80 percent of the cases studied, attackers hit specific technologies weeks before a new vulnerability affecting them was published. 

Early Warning Signals: When Attacker Behavior Precedes New Vulnerabilities breaks down this pattern, explores why it happens, and offers actionable insights to help defenders act before the next CVE drops.

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What’s Inside the Report? 

• The 6-Week Critical Window — 80 percent of pre-disclosure spikes led to new CVEs within six weeks. 
• Technology Breakdowns — Which vendors show the strongest warning patterns — and which don’t. 
• Tactical Insights — What defenders should do when they observe suspicious spikes. 
• The Attacker’s Playbook — Why attackers might generate early activity — and how to counter it. 

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Why Download? 

• Anticipate threats before they’re disclosed.
• Learn how spikes signal the need to harden defenses. 
• Block smarter — Stop inventorying activity before it turns into exploitation.

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