What’s Vulnerable › Vulnerabilities

CVE-2021-45468

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-01-14 · updated 2026-06-17
• Weakness: CWE-444

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.

Affected products

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

How to fix

Upgrade to a fixed version: Imperva Web Application Firewall 2021-12-23. Check the vendor advisory for mitigations.

References

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

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