TI-2021-20555 Aliases CVE-2021-45468 GHSA-332m-xp6m-r638

Imperva Web Application Firewall (WAF) before 2021-12-23 allows remote unauthenticated…

MEDIUM 49CWE-444Published 2022-01-14 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

EPSS 0.04219 91st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:imperva:web_application_firewall::::::::	before 2021-12-23	Vulnerable	Imperva

cpe:2.3:a:imperva:web_application_firewall:*:*:*:*:*:*:*:* Versions before 2021-12-23 Vulnerable ·Imperva

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-45468
2026-10-03 Alias added: GHSA-332m-xp6m-r638

References

Exploit 1

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

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences