add one article

Author: xanhacks

content/docs/getting-started/vulnerability-reports.md

@@ -104,6 +104,10 @@ toc: true
 
 - [Unsecure time-based secret and Sandwich Attack](https://www.aeth.cc/public/Article-Reset-Tolkien/secret-time-based-article-en.html)
 
+## WAF
+
+- [Response Filter Denial of Service (RFDoS): shut down a website by triggering WAF rule](https://blog.sicuranext.com/response-filter-denial-of-service-a-new-way-to-shutdown-a-website/)
+
 ## Others
 
 - [Article - Detecting uBlock on Chrome Browser](https://blog.ankursundara.com/checking-enumerating-a-users-browser-extensions/)