CVE-2021-45468
Imperva Web Application Firewall (WAF) before 2021-12-31 allows remote unauthenticated attackers...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-45468- 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 - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-444
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-45468- Updated
- 2026-11-02
EUVDEUVD-2021-32234 No score
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.
- Record
EUVD-2021-32234- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-332m-xp6m-r638 No score
Imperva Web Application Firewall (WAF) before 2021-12-31 allows remote unauthenticated attackers...
Imperva Web Application Firewall (WAF) before 2021-12-31 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.
- Record
GHSA-332m-xp6m-r638- Weakness
- CWE-444
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | 0xhaggis/Imperva_gzip_bypass | 2021-12-12 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-45468 is a critical vulnerability (CVSS 9.8) in Imperva Web Application Firewall, published January 14, 2022. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 4.22%, the 91st percentile. No source names a fixed version.