CVE-2024-34364Network attack vector

Proxy crash via unbounded async response buffering

Published Jun 4, 2024 · Updated Aug 2, 2024

Resource exhaustion in Envoy allows remote attackers controlling an upstream service to crash the proxy with an oversized response. The async HTTP client fully buffers mirror responses without a size limit, allowing a malicious backend to consume available memory. Exposure requires a mirror cluster or another affected async-client consumer; successful exploitation terminates Envoy through out-of-memory exhaustion.

CVSS severity5.7
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Envoy allows remote attackers controlling an upstream service to crash the proxy with an oversized response. The async HTTP client fully buffers mirror responses without a size limit, allowing a malicious backend to consume available memory. Exposure requires a mirror cluster or another affected async-client consumer; successful exploitation terminates Envoy through out-of-memory exhaustion.

The record

CVE
CVE-2024-34364
Published
Jun 4, 2024
Updated
Aug 2, 2024
Vendor
Envoy Proxy
Product
Envoy
Classifications
CWE-400, CWE-787, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=<= 1.27.5
  2. Affected versionversion=>= 1.28.0, <= 1.28.3
  3. Affected versionversion=>= 1.29.0, <= 1.29.4
  4. Affected versionversion=>= 1.30.0, <= 11.30.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Envoy Proxy · Envoyversion=<= 1.27.5; version=>= 1.28.0, <= 1.28.3; version=>= 1.29.0, <= 1.29.4; version=>= 1.30.0, <= 11.30.1

Published CVSS scores

5.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-787Out-of-bounds Write
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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