CVE-2023-40594

Daemon crash via improperly validated printf expression

Published Aug 30, 2023 · Updated Feb 28, 2025

Denial of service in Splunk Web allows local users to crash vulnerable Splunk Enterprise and Splunk Cloud Platform instances via a crafted search. The printf SPL function improperly validates expressions when commands such as fieldformat appear earlier in the search pipeline, causing the Splunk daemon to crash. A user must be able to submit SPL searches; the resulting daemon crash interrupts the affected instance without reported data disclosure or modification.

CVSS severity6.5
Medium
EPSS probability0.40%
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 Web allows local users to crash vulnerable Splunk Enterprise and Splunk Cloud Platform instances via a crafted search. The printf SPL function improperly validates expressions when commands such as fieldformat appear earlier in the search pipeline, causing the Splunk daemon to crash. A user must be able to submit SPL searches; the resulting daemon crash interrupts the affected instance without reported data disclosure or modification.

The record

CVE
CVE-2023-40594
Published
Aug 30, 2023
Updated
Feb 28, 2025
Vendor
Splunk, Inc.
Product
Splunk Enterprise
Classifications
CWE-400, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 28, 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=8.2 <8.2.12
  2. Affected versionversion=9.0 <9.0.6
  3. Affected versionversion=9.1 <9.1.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Splunk, Inc. · Splunk Enterpriseversion=8.2 <8.2.12; version=9.0 <9.0.6; version=9.1 <9.1.1
Splunk, Inc. · Splunk Cloud Platformversion=- <9.0.2303.100

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5Splunk Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application 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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