VulnerabilityModified
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.
CRITICAL 9.8EPSS 3.99%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.99%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 3.99% probability · 90th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-444
- Affected
- imperva/web application firewall
- Source
- cve@mitre.org
References
- https://bishopfox.com/blog/imperva-eliminates-critical-exposureExploit, Third Party Advisory
- https://bishopfox.com/blog/imperva-eliminates-critical-exposureExploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.