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Servers and applications

CVE-2019-18838

An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host header, it sends an internally generated "Invalid request" response. This internally generated response is dispatched through the configured encoder filter chain before being sent to the client. An encoder filter that invokes route manager APIs that access a request's Host header causes a NULL…

Severity
High 7.5
Published
13 Dec 2019
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
2.1% in the next 30 daysHigher than 82% of CVEs. EPSS by FIRST, 10 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
EnvoyServers and applications · cpe:a:envoyproxy:envoy
  • Every version up to 1.12.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2019-18838
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2019-18838