CVE-2021-45468

CRITICAL 9.8CVE-2021-45468 · Published 14/01/2022 · updated 17/06/2026

In short

CVE-2021-45468 is a CRITICAL (CVSS 9.8) vulnerability affecting web application firewall (imperva).
Chance of exploitation in the next 30 days (EPSS): 4.0%, higher than 90.5% of all vulnerabilities.
Fix: update to 2021-12-23 or later.

Package	Affected versions	Patched versions
web application firewall imperva	`< 2021-12-23`	`2021-12-23`

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.

References

bishopfox.com/blog/imperva-eliminates-critical-exposure · Exploit

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