CVE-2021-45468

CRITICAL

Imperva Web Application Firewall < 2021-12-23 - Unauthenticated HTTP Request Smuggling via Gzip Content-Encoding

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-45468. PoCs published by 0xhaggis.

AI-analyzed exploit summary This repository contains a Python script and documentation for CVE-2021-45468, which exploits a bypass in Imperva WAF by adding a 'Content-Encoding: gzip' header to HTTP POST requests, allowing malicious payloads to evade detection.

Description

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.

Exploits (1)

nomisec WORKING POC 5 stars
by 0xhaggis · poc
https://github.com/0xhaggis/Imperva_gzip_bypass

This repository contains a Python script and documentation for CVE-2021-45468, which exploits a bypass in Imperva WAF by adding a 'Content-Encoding: gzip' header to HTTP POST requests, allowing malicious payloads to evade detection.

Classification
Working Poc 100%
Attack Type
Auth Bypass
Complexity
Trivial
Reliability
Reliable
Target: Imperva Cloud WAF, Imperva SecureSphere
No auth needed
Prerequisites: A target URL that supports POST requests · Imperva WAF protection on the target
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (1)

Core 1
Core References
Exploit, Third Party Advisory x_refsource_misc
https://bishopfox.com/blog/imperva-eliminates-critical-exposure

Scores

CVSS v3 9.8
EPSS 0.0399
EPSS Percentile 89.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-444
Status published
Products (1)
imperva/web_application_firewall < 2021-12-23
Published Jan 14, 2022
Tracked Since Feb 18, 2026