CVE-2022-43572Network attack vector

Indexing denial of service via malformed ingestion file

Published Nov 4, 2022 · Updated May 1, 2025

Denial of service in Splunk Enterprise allows remote attackers to block indexing via malformed S2S or HEC files in affected releases. The indexer fails to safely process a malformed file received through either ingestion protocol and stops accepting further data for indexing. Unauthenticated network reachability is sufficient by default; TLS-protected deployments require a compromised HEC token, shared secret, client certificate, or trusted certificate chain.

CVSS severity7.5
High
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Splunk Enterprise allows remote attackers to block indexing via malformed S2S or HEC files in affected releases. The indexer fails to safely process a malformed file received through either ingestion protocol and stops accepting further data for indexing. Unauthenticated network reachability is sufficient by default; TLS-protected deployments require a compromised HEC token, shared secret, client certificate, or trusted certificate chain.

The record

CVE
CVE-2022-43572
Published
Nov 4, 2022
Updated
May 1, 2025
Vendor
Splunk, Inc.
Product
Splunk Enterprise
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 4, 2022CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=8.1 <8.1.12
  2. Affected versionversion=8.2 <8.2.9
  3. Affected versionversion=9.0 <9.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Splunk, Inc. · Splunk Enterpriseversion=8.1 <8.1.12; version=8.2 <8.2.9; version=9.0 <9.0.2

Published CVSS scores

5.9Splunk, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5Splunk, Inc.CVSS: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
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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