Every CVE Search/ Get API key

CVE-2019-18838

An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host...

7.5 High

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 pointer dereference, resulting in abnormal termination of the Envoy process.

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
None
Integrity
None
Availability
High

Exploit likelihood

2.14%Up 1.1 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

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 pointer dereference, resulting in abnormal termination of the Envoy process.

Record
CVE-2019-18838
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-476
Updated
2026-11-02
CVE List No score

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 pointer dereference, resulting in abnormal termination of the Envoy process.

Record
CVE-2019-18838
Updated
2026-11-02
EUVDEUVD-2019-8539 No score

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 pointer dereference, resulting in abnormal termination of the Envoy process.

Record
EUVD-2019-8539
Updated
2026-11-03
GitHub AdvisoriesGHSA-m3j5-qf4q-m73w 7.5

An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host...

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 pointer dereference, resulting in abnormal termination of the Envoy process.

Record
GHSA-m3j5-qf4q-m73w
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
OSV 7.5

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 pointer dereference, resulting in abnormal termination of the Envoy process.

Record
CVE-2019-18838
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2019:4222 8.1

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.0.3 RPMs security update

Record
RHSA-2019:4222
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
kiali
Red Hat:service_mesh:1.0::el7
From an advisory covering 3 CVEs
 before 0:v1.0.8.redhat1-1.el7
0:v1.0.8.redhat1-1.el7
servicemesh
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-citadel
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-cni
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-galley
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-grafana
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:6.2.2-25.el8
0:6.2.2-25.el8
servicemesh-grafana-prometheus
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:6.2.2-25.el8
0:6.2.2-25.el8
servicemesh-istioctl
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-mixc
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-mixs
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
Show 6 moreShow less
Affected packages
PackageAffectedFixed
servicemesh-operator
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-pilot-agent
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-pilot-discovery
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-prometheus
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:2.7.2-26.el8
0:2.7.2-26.el8
servicemesh-proxy
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-sidecar-injector
Red Hat:service_mesh:1.0::el8
From an advisory covering 3 CVEs
 before 0:1.0.3-1.el8
0:1.0.3-1.el8

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-18838 is a high vulnerability (CVSS 7.5) in Envoyproxy Envoy, published December 13, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.14%, the 82nd percentile. No source names a fixed version.

References

Show 16 moreShow less
Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open