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The article addresses a critical gap in security operations where traditional logging fails to detect zero-day exploits due to the absence of known signatures at the time of the attack. It argues that retrospective analysis requires continuous, full-line-rate packet capture rather than reactive or conditional recording methods. This approach is essential for AI-driven SOCs to effectively interrogate historical data and validate whether hosts were compromised before patches were applied.

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The Zero-Day Blind Spot: Why Your Agentic SOC needs Retrospective Packet Replay

Cisco BlogsOctober 8, 20267 min read

Learn how the .conf26 Agentic SOC paired Endace full PCAP with Cisco Secure Firewall and Talos rules to retrospectively replay wire data against zero-days.

Zero-day exploits have always posed a significant challenge for organizations, and the focus is even sharper given the rise of AI-based vulnerability discovery and AI-based tools that facilitate faster exploitation and more sophisticated attacks, even by less sophisticated attackers. While most of the focus is rightly placed on protecting assets from zero-day exploits, it is also critical to determine whether a host was compromised before patches or other mitigations were implemented. Organizations can no longer assume that a lack of current alerts means a clean bill of health; they must actively interrogate their own past. However, assessing whether a zero-day vulnerability was exploited in the past essentially involves going back in time. Relying on standard logs or “Conditional / Selective PCAP” systems during a zero-day investigation leaves the…

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