CVE-2022-29224Network attack vector

Unauthenticated upstream-triggered crash via gRPC health check

Published Jun 9, 2022 · Updated Apr 23, 2025

A denial-of-service flaw in Envoy before 1.22.1 allows remote attackers to crash the proxy via gRPC health checking. GrpcHealthCheckerImpl dereferences a null pointer after a service-discovered upstream is removed while a held host's gRPC health check fails. Exploitation requires control of both the upstream host and its service-discovery record; impact is limited to Envoy process termination.

CVSS severity5.9
Medium
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A denial-of-service flaw in Envoy before 1.22.1 allows remote attackers to crash the proxy via gRPC health checking. GrpcHealthCheckerImpl dereferences a null pointer after a service-discovered upstream is removed while a held host's gRPC health check fails. Exploitation requires control of both the upstream host and its service-discovery record; impact is limited to Envoy process termination.

The record

CVE
CVE-2022-29224
Published
Jun 9, 2022
Updated
Apr 23, 2025
Vendor
Envoy Proxy
Product
Envoy
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.22.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Envoy Proxy · Envoyversion=< 1.22.1

Published CVSS scores

5.9GitHub CNACVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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