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CVE-2019-18801

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that...

9.8 CriticalFix available

CVE-2019-18801 is a critical vulnerability (CVSS 9.8) 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 2.50%, the 84th percentile. Fixed in kiali 0:v1.0.8.redhat1-1.el7.

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to corrupt nearby heap contents (leading to a query-of-death scenario) or may be used to bypass Envoy's access control mechanisms such as path based routing. An attacker can also modify requests from other users that happen to be proximal temporally and spatially.

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
High
Integrity
High
Availability
High

Exploit likelihood

2.50%Up 1.3 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 9.8

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to corrupt nearby heap contents (leading to a query-of-death scenario) or may be used to bypass Envoy's access control mechanisms such as path based routing. An attacker can also modify requests from other users that happen to be proximal temporally and spatially.

Record
CVE-2019-18801
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-787
Updated
2026-11-02
CVE List No score

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to corrupt nearby heap contents (leading to a query-of-death scenario) or may be used to bypass Envoy's access control mechanisms such as path based routing. An attacker can also modify requests from other users that happen to be proximal temporally and spatially.

Record
CVE-2019-18801
Updated
2026-11-02
EUVDEUVD-2019-8506 No score

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to corrupt nearby heap contents (leading to a query-of-death scenario) or may be used to bypass Envoy's access control mechanisms such as path based routing. An attacker can also modify requests from other users that happen to be proximal temporally and spatially.

Record
EUVD-2019-8506
Updated
2026-11-03
GitHub AdvisoriesGHSA-288h-hv2q-fwrv 9.8

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that...

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to corrupt nearby heap contents (leading to a query-of-death scenario) or may be used to bypass Envoy's access control mechanisms such as path based routing. An attacker can also modify requests from other users that happen to be proximal temporally and spatially.

Record
GHSA-288h-hv2q-fwrv
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-787
Updated
2026-11-02
OSV 9.8

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to corrupt nearby heap contents (leading to a query-of-death scenario) or may be used to bypass Envoy's access control mechanisms such as path based routing. An attacker can also modify requests from other users that happen to be proximal temporally and spatially.

Record
CVE-2019-18801
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
 before 0:v1.0.8.redhat1-1.el7
0:v1.0.8.redhat1-1.el7
servicemesh
Red Hat:service_mesh:1.0::el8
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-citadel
Red Hat:service_mesh:1.0::el8
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-cni
Red Hat:service_mesh:1.0::el8
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-galley
Red Hat:service_mesh:1.0::el8
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-grafana
Red Hat:service_mesh:1.0::el8
 before 0:6.2.2-25.el8
0:6.2.2-25.el8
servicemesh-grafana-prometheus
Red Hat:service_mesh:1.0::el8
 before 0:6.2.2-25.el8
0:6.2.2-25.el8
servicemesh-istioctl
Red Hat:service_mesh:1.0::el8
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-mixc
Red Hat:service_mesh:1.0::el8
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-mixs
Red Hat:service_mesh:1.0::el8
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
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Affected packages
PackageAffectedFixed
servicemesh-operator
Red Hat:service_mesh:1.0::el8
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-pilot-agent
Red Hat:service_mesh:1.0::el8
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-pilot-discovery
Red Hat:service_mesh:1.0::el8
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-prometheus
Red Hat:service_mesh:1.0::el8
 before 0:2.7.2-26.el8
0:2.7.2-26.el8
servicemesh-proxy
Red Hat:service_mesh:1.0::el8
 before 0:1.0.3-1.el8
0:1.0.3-1.el8
servicemesh-sidecar-injector
Red Hat:service_mesh:1.0::el8
 before 0:1.0.3-1.el8
0:1.0.3-1.el8

History

History
WhenChangedSources
2026-11-03aliasesEUVD
2026-11-02createdCVE List, GitHub Advisories, NVD, OSV

References

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