CVE-2021-45468

9.8 criticalEPSS 4.0%

Critical (9.8) in imperva web application firewall. EPSS 4.0% 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.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 4.0% chance of exploitation in the next 30 days; higher than 90% of CVEs (scores of 2026-10-31)
CWE: CWE-444
Published: 2022-01-14
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

imperva:web_application_firewall

References

https://bishopfox.com/blog/imperva-eliminates-critical-exposure
https://bishopfox.com/blog/imperva-eliminates-critical-exposure

Check your stack JSON