Handling application errors during scans
Summary: PortSwigger describes how Burp's current Scanner processes each scan queue item in isolation, abandoning items when it hits connection errors and transmission timeouts and then moving to the next. The new Scanner adds separate options for handling application errors during the crawl and audit phases, tracking errors at the level of individual audit checks, insertion points, the request being audited, and ultimately the entire scan.
Key Takeaway: Web application firewalls that selectively drop connections based on specific payloads or on modifications to a specific parameter can cause a scanner to silently abandon items, so a clean scan result may reflect dropped connections rather than an absence of vulnerabilities.
Read the original at PortSwigger Research ↗
- Topics
- Vulnerabilities & Patching
- Related
- Attackers Exploit UnrealIRCd Flaw That Enables Server-Level Command Injection Cyber Risks · Nov 14, 2026U.S. CISA adds Check Point and UnrealIRCd flaws to its Known Exploited Vulnerabilities catalog Cyber Risks · Nov 14, 2026PostgreSQL Patches 52 Flaws, Including 22-Year-Old Bug Enabling Authenticated RCE Cyber Risks · Nov 13, 2026