🕳️ Vulnerabilities & CVEs

Hackers Are Chunking Data to Dodge Your Next-Gen Firewall's App-ID Trap

Ever wonder why your shiny next-gen firewall lets the first 5KB of hacker traffic sail through? It's not a bug—it's the feature killing your data exfiltration defenses.

Elena Vasquez 📅 Apr 03, 2026 ⏱️ 3 min read 👁️ 0 views
Diagram showing chunked data packets bypassing firewall App-ID detection during exfiltration

⚡ Key Takeaways

  • Next-gen firewalls like Palo Alto App-ID let first 5KB of exfil traffic through by design, creating a bypass window.
  • Chunking data into 3KB pieces with retries fools classification, enabling stealthy megabyte-scale exfiltration.
  • Fixes demand policy overhauls—vendors profit from the hype, but zero trust is the real armor.

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Elena Vasquez
Written by

Elena Vasquez

Senior editor and generalist covering the biggest stories with a sharp, skeptical eye.

#Palo Alto App-ID #app-id bypass #application control bypass #chunked transfer #data exfiltration #next-gen firewall bypass #palo alto firewall

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Originally reported by SANS Internet Storm Center

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