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CVE-2022-23606

Crash when a cluster is deleted in Envoy

4.4 MediumFix available

Envoy is an open source edge and service proxy, designed for cloud-native applications. When a cluster is deleted via Cluster Discovery Service (CDS) all idle connections established to endpoints in that cluster are disconnected. A recursion was introduced in the procedure of disconnecting idle connections that can lead to stack exhaustion and abnormal process termination when a cluster has a large number of idle connections. This infinite recursion causes Envoy to crash. Users are advised to upgrade.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
High
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.02%Up 0.1 points since Feb 23, 2022
90%50%10%1%

What each source reports

CVE List Score used 4.4

Crash when a cluster is deleted in Envoy

Envoy is an open source edge and service proxy, designed for cloud-native applications. When a cluster is deleted via Cluster Discovery Service (CDS) all idle connections established to endpoints in that cluster are disconnected. A recursion was introduced in the procedure of disconnecting idle connections that can lead to stack exhaustion and abnormal process termination when a cluster has a large number of idle connections. This infinite recursion causes Envoy to crash. Users are advised to upgrade.

Record
CVE-2022-23606
CVSS 3.1
4.4 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-674
Updated
2026-11-02
EUVDEUVD-2022-28576 4.4

Envoy is an open source edge and service proxy, designed for cloud-native applications. When a cluster is deleted via Cluster Discovery Service (CDS) all idle connections established to endpoints in that cluster are disconnected. A recursion was introduced in the procedure of disconnecting idle connections that can lead to stack exhaustion and abnormal process termination when a cluster has a large number of idle connections. This infinite recursion causes Envoy to crash. Users are advised to upgrade.

Record
EUVD-2022-28576
CVSS 3.1
4.4 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
NVD 4.4

Envoy is an open source edge and service proxy, designed for cloud-native applications. When a cluster is deleted via Cluster Discovery Service (CDS) all idle connections established to endpoints in that cluster are disconnected. A recursion was introduced in the procedure of disconnecting idle connections that can lead to stack exhaustion and abnormal process termination when a cluster has a large number of idle connections. This infinite recursion causes Envoy to crash. Users are advised to upgrade.

Record
CVE-2022-23606
CVSS 3.1
4.4 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
4.0 MediumAV:N/AC:L/Au:S/C:N/I:N/A:P
Weakness
CWE-674
Updated
2026-11-02
OSV 4.4

Crash when a cluster is deleted in Envoy

Envoy is an open source edge and service proxy, designed for cloud-native applications. When a cluster is deleted via Cluster Discovery Service (CDS) all idle connections established to endpoints in that cluster are disconnected. A recursion was introduced in the procedure of disconnecting idle connections that can lead to stack exhaustion and abnormal process termination when a cluster has a large number of idle connections. This infinite recursion causes Envoy to crash. Users are advised to upgrade.

Record
CVE-2022-23606
CVSS 3.1
4.4 MediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-674
Updated
2026-11-02
OSVRHSA-2022:1275 9.4

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 2.1.2 security update

Record
RHSA-2022:1275
CVSS 3.1
9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Updated
2026-11-02
OSVRHSA-2022:1276 9.4

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 2.0.9 security update

Record
RHSA-2022:1276
CVSS 3.1
9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Updated
2026-11-02
OSVBIT-envoy-2022-23606 No score

Crash when a cluster is deleted in Envoy

Envoy is an open source edge and service proxy, designed for cloud-native applications. When a cluster is deleted via Cluster Discovery Service (CDS) all idle connections established to endpoints in that cluster are disconnected. A recursion was introduced in the procedure of disconnecting idle connections that can lead to stack exhaustion and abnormal process termination when a cluster has a large number of idle connections. This infinite recursion causes Envoy to crash. Users are advised to upgrade.

Record
BIT-envoy-2022-23606
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
envoy
Bitnami
 1.20.0 up to 1.20.2, 1.21.0 up to 1.21.1
1.20.21.21.1
servicemesh-proxy
Red Hat:service_mesh:2.1::el8
From an advisory covering 8 CVEs
 before 0:2.1.2-4.el8
0:2.1.2-4.el8
servicemesh-proxy-debuginfo
Red Hat:service_mesh:2.1::el8
From an advisory covering 8 CVEs
 before 0:2.1.2-4.el8
0:2.1.2-4.el8
servicemesh-proxy-debugsource
Red Hat:service_mesh:2.1::el8
From an advisory covering 8 CVEs
 before 0:2.1.2-4.el8
0:2.1.2-4.el8
servicemesh-proxy-wasm
Red Hat:service_mesh:2.1::el8
From an advisory covering 8 CVEs
 before 0:2.1.2-4.el8
0:2.1.2-4.el8
servicemesh
Red Hat:service_mesh:2.1::el8
From an advisory covering 8 CVEs
 before 0:2.1.2-4.el8
0:2.1.2-4.el8
servicemesh-cni
Red Hat:service_mesh:2.1::el8
From an advisory covering 8 CVEs
 before 0:2.1.2-4.el8
0:2.1.2-4.el8
servicemesh-pilot-agent
Red Hat:service_mesh:2.1::el8
From an advisory covering 8 CVEs
 before 0:2.1.2-4.el8
0:2.1.2-4.el8
servicemesh-pilot-discovery
Red Hat:service_mesh:2.1::el8
From an advisory covering 8 CVEs
 before 0:2.1.2-4.el8
0:2.1.2-4.el8
servicemesh
Red Hat:service_mesh:2.0::el8
From an advisory covering 16 CVEs
 before 0:2.0.9-3.el8
0:2.0.9-3.el8
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Affected packages
PackageAffectedFixed
servicemesh-istioctl
Red Hat:service_mesh:2.0::el8
From an advisory covering 16 CVEs
 before 0:2.0.9-3.el8
0:2.0.9-3.el8
servicemesh-mixc
Red Hat:service_mesh:2.0::el8
From an advisory covering 16 CVEs
 before 0:2.0.9-3.el8
0:2.0.9-3.el8
servicemesh-mixs
Red Hat:service_mesh:2.0::el8
From an advisory covering 16 CVEs
 before 0:2.0.9-3.el8
0:2.0.9-3.el8
servicemesh-pilot-agent
Red Hat:service_mesh:2.0::el8
From an advisory covering 16 CVEs
 before 0:2.0.9-3.el8
0:2.0.9-3.el8
servicemesh-pilot-discovery
Red Hat:service_mesh:2.0::el8
From an advisory covering 16 CVEs
 before 0:2.0.9-3.el8
0:2.0.9-3.el8
kiali
Red Hat:service_mesh:2.0::el8
From an advisory covering 16 CVEs
 before 0:v1.24.7.redhat1-1.el8
0:v1.24.7.redhat1-1.el8
servicemesh-prometheus
Red Hat:service_mesh:2.0::el8
From an advisory covering 16 CVEs
 before 0:2.14.0-16.el8.1
0:2.14.0-16.el8.1
servicemesh-proxy
Red Hat:service_mesh:2.0::el8
From an advisory covering 16 CVEs
 before 0:2.0.9-3.el8
0:2.0.9-3.el8

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, NVD, OSV

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

In short

CVE-2022-23606 is a medium vulnerability (CVSS 4.4) in Envoyproxy Envoy, published February 22, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.02%, the 63rd percentile. Fixed in envoy 1.20.2.

References

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