CVE-2023-5625Network attack vector

Remote service interruption via oversized WebSocket frames

Published Nov 1, 2023 · Updated Nov 20, 2025

Resource exhaustion in Red Hat python-eventlet builds for OpenStack 17.1 and OpenShift Ironic 4.12 allows remote attackers to interrupt services. A Red Hat packaging regression omitted the prior eventlet/websocket.py frame-length patch, leaving oversized and highly compressed WebSocket frames able to drive unbounded memory allocation. Exploitation requires access to an Eventlet WebSocket endpoint and affects availability without reported data disclosure or modification.

CVSS severity5.3
Medium
EPSS probability0.80%
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 Red Hat python-eventlet builds for OpenStack 17.1 and OpenShift Ironic 4.12 allows remote attackers to interrupt services. A Red Hat packaging regression omitted the prior eventlet/websocket.py frame-length patch, leaving oversized and highly compressed WebSocket frames able to drive unbounded memory allocation. Exploitation requires access to an Eventlet WebSocket endpoint and affects availability without reported data disclosure or modification.

The record

CVE
CVE-2023-5625
Published
Nov 1, 2023
Updated
Nov 20, 2025
Vendor
Red Hat
Product
Red Hat OpenStack Platform 17.1
Classifications
CWE-770, CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 2025Record 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?

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 Platform 17.1Affected versions are unavailable in this record.
Red Hat · Ironic content for Red Hat OpenShift Container PlatformAffected versions are unavailable in this record.

Published CVSS scores

5.3Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5NIST NVDCVSS: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-770Allocation of Resources Without Limits or Throttling
CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

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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