This tweet brings attention to the fact that not all Web Application Firewall (WAF) bypass techniques are obsolete. Some evasion tactics remain effective and are still used in real-world attacks today. Despite numerous improvements in WAF technology, certain tricks can still circumvent protections provided by major WAF vendors. These tactics often exploit subtle weaknesses in how WAFs analyze and filter web traffic, such as bypassing with encoding tricks, using unusual request formats, or leveraging obscure vulnerabilities. The continuing effectiveness of these evasion methods highlights the importance of staying updated with the latest security research and continuously improving WAF rulesets to protect applications from emerging threats.
Original tweet: https://twitter.com/briskinfosec/status/1945085034383175850