CVE-2024-4436Network attack vector

Service interruption via crafted HTTP/2 streams

Published May 8, 2024 · Updated Nov 10, 2025

Resource exhaustion in etcd in Red Hat OpenStack Platform 16.1 and 16.2 allows remote attackers to interrupt service via HTTP/2. The bundled etcd binary links golang.org/x/net/http2 instead of Red Hat's patched RHEL implementation, leaving the HPACK decoder exposed to excessive CPU consumption from a few small crafted streams. Attackers must reach an etcd HTTP/2 endpoint; the resulting CPU exhaustion denies service without reported data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.77%
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 etcd in Red Hat OpenStack Platform 16.1 and 16.2 allows remote attackers to interrupt service via HTTP/2. The bundled etcd binary links golang.org/x/net/http2 instead of Red Hat's patched RHEL implementation, leaving the HPACK decoder exposed to excessive CPU consumption from a few small crafted streams. Attackers must reach an etcd HTTP/2 endpoint; the resulting CPU exhaustion denies service without reported data disclosure or modification.

The record

CVE
CVE-2024-4436
Published
May 8, 2024
Updated
Nov 10, 2025
Vendor
Red Hat
Product
Red Hat OpenStack Platform
Classifications
CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 10, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Red Hat · Red Hat OpenStack PlatformAffected versions are unavailable in this record.
Red Hat · Red Hat OpenStack Services on OpenShiftAffected versions are unavailable in this record.

Published CVSS scores

7.5Red Hat Product SecurityCVSS:3.1/AV:N/AC:L/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
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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