THREATPORT/VULNERABILITY/CVE-2021-45468
CRITICAL SEVERITY

CVE-2021-45468

Web Application Firewall vulnerability

CVSS
9.8
EPSS
4.0%
EPSS pct
89th
Exploited
No known
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 vendor
Imperva
Affected product
Web Application Firewall
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
Published
2022-01-14

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 4.0% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 89% of all scored CVEs.

Check your external exposure to CVE-2021-45468

  • Confirm whether Imperva Web Application Firewall is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-45468.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-45468

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-45468 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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Are you exposed to CVE-2021-45468?

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