CVE-2021-45468: Imperva Web Application Firewall

Critical severity, CVSS 9.8. EPSS: 4% chance of exploitation in the next 30 days.

Imperva Web Application Firewall (WAF) before 2021-12-23 allows remote unauthenticated attackers to use "Content-Encoding: gzip" to evade WAF security controls and send malicious HTTP POST requests to web servers behind the WAF.

Affected products

• Imperva Web Application Firewall: before 2021-12-23 (fixed in 2021-12-23)

Published 2022-01-14. Last modified 2026-06-17.