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Fencer Vulns
medium 4.4

CVE-2022-23606 json

Crash when a cluster is deleted in Envoy

published 2022-02-22 4 y ago modified 2026-09-08 2 mo ago also BIT-envoy-2022-23606 , EUVD-2022-28576 , GHSA-9vp2-4cp7-vvxf

cvss
4.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami envoy 1.20.2, 1.21.1
  • envoyproxy envoy 1.20.2
  • kiali service mesh 2.0 v1.24.7.redhat1-1.el8
  • servicemesh service mesh 2.0 2.0.9-3.el8
  • servicemesh-mixc service mesh 2.0 2.0.9-3.el8
  • servicemesh-mixs service mesh 2.0 2.0.9-3.el8
  • servicemesh-proxy service mesh 2.0 2.0.9-3.el8
  • servicemesh-istioctl service mesh 2.0 2.0.9-3.el8
  • servicemesh-prometheus service mesh 2.0 2.14.0-16.el8.1
  • servicemesh-pilot-agent service mesh 2.0 2.0.9-3.el8

red hat advisories RHSA-2022:1276RHSA-2022:1275

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-23606 updated cvss 6.5

envoy: Stack exhaustion when a cluster is deleted via Cluster Discovery Service

  • Red Hat OpenShift Service Mesh 2.0 servicemesh-proxy 2.0.9-3.el8
    fixed: vendor fix RHSA-2022:1276
  • Red Hat OpenShift Service Mesh 2.1 servicemesh-proxy 2.1.2-4.el8, servicemesh-proxy-wasm 2.1.2-4.el8
    fixed: vendor fix RHSA-2022:1275
  • Red Hat OpenShift Service Mesh 2.0 servicemesh 2.0.9-3.el8, kiali v1.24.7.redhat1-1.el8, servicemesh-cni 2.0.9-3.el8, servicemesh-mixc 2.0.9-3.el8, servicemesh-mixs 2.0.9-3.el8, servicemesh-istioctl 2.0.9-3.el8, +4 more Red Hat OpenShift Service Mesh 2.1 servicemesh 2.1.2-4.el8, servicemesh-cni 2.1.2-4.el8, servicemesh-operator 2.1.2-4.el8, servicemesh-ratelimit 2.1.2-4.el8, servicemesh-pilot-agent 2.1.2-4.el8, servicemesh-prometheus 2.23.0-5.el8, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

1.02% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.4 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami envoy
>=1.20.0, <1.20.2
>=1.21.0, <1.21.1
1.20.2
1.21.1

Affected products

  • envoyproxy envoy

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.