Vulnerability in Imperva Web Application Firewall
CVE-2021-45468
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.
Vulnerability class: HTTP Request Smuggling
EPSS: 0.040 (89.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Imperva Web_application_firewall
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-45468?
- CVE-2021-45468 is a critical-severity vulnerability in Imperva Web Application Firewall, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 9.8/10. Published 2022-01-14.
- How severe is CVE-2021-45468?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-45468 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.