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Web application firewall
HTTP specific network security system
A web application firewall (WAF) is a specific form of application firewall that filters, monitors, and blocks HTTP traffic to and from a web service. By inspecting HTTP traffic, it can prevent attacks exploiting a web application's known vulnerabilities, such as SQL injection, cross-site scripting (XSS), file inclusion, and improper system configuration. Most of the major financial institutions utilize WAFs to help in the mitigation of web application 'zero-day' vulnerabilities, as well as hard to patch bugs or weaknesses through custom attack signature strings.
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