This article is about a sub-type of an application firewall. For the article on application firewalls, see Application firewall. For the primary topic of firewalls, see Firewall (computing).
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.[1] They can introduce a performance degradation without proper configuration and tuning from Cyber Security specialist.[2] However, 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. [3]
^"Web Application Firewall". TechTarget. Retrieved 10 April 2018.
^Stop deploying web application firewalls
^Detecting zero-days before zero-day
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