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CVE-2025-20387— Incorrect permissions assignment on Splunk Universal Forwarder for Windows during new installation or upgrade

Quick assessment

Affected
Splunk Splunk Enterprise
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Splunk Universal Forwarder是Splunk公司的一个Splunk组件。 Splunk Universal Forwarder 10.0.2之前版本、9.4.6版本、9.3.8版本和9.2.10版本存在安全漏洞，该漏洞源于安装或升级时权限分配不当，可能导致非管理员用户访问安装目录及其内容。

CVSS 8.0 · High EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token
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I. Basic Information for CVE-2025-20387

Vulnerability Information
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Vulnerability Title
Incorrect permissions assignment on Splunk Universal Forwarder for Windows during new installation or upgrade
Source: CVE Program / CVE List V5
Vulnerability Description
In Splunk Universal Forwarder for Windows versions below 10.0.2, 9.4.6, 9.3.8, and 9.2.10, a new installation of or an upgrade to an affected version can result in incorrect permissions assignment in the Universal Forwarder for Windows Installation directory. This lets non-administrator users on the machine access the directory and all its contents.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5
Vulnerability Title
Splunk Universal Forwarder 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Splunk Universal Forwarder是Splunk公司的一个Splunk组件。 Splunk Universal Forwarder 10.0.2之前版本、9.4.6版本、9.3.8版本和9.2.10版本存在安全漏洞，该漏洞源于安装或升级时权限分配不当，可能导致非管理员用户访问安装目录及其内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Splunk Splunk Enterprise 10.0 ~ 10.0.2 -

II. Public POCs for CVE-2025-20387

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III. Intelligence Information for CVE-2025-20387

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Vendor Advisories for CVE-2025-20387 (1)

Same Patch Batch · Splunk · 2025-12-03 · 9 CVEs total

CVE-2025-20386 8.0 HIGH Incorrect permission assignment on Splunk Enterprise for Windows during new installation o
CVE-2025-20381 5.4 MEDIUM SPL commands allowlist controls bypass in Splunk MCP Server app through "run_splunk_query"
CVE-2025-20384 5.3 MEDIUM Unauthenticated Log Injection in Splunk Enterprise
CVE-2025-20389 4.3 MEDIUM Improper Input Validation in "label" column field in Splunk Secure Gateway App
CVE-2025-20383 4.3 MEDIUM Improper access control through push notifications for reports and alerts in Splunk Secure
CVE-2025-20382 3.5 LOW URL validation bypass through Views Dashboard in Splunk Enterprise
CVE-2025-20388 2.7 LOW Blind Server Side Request Forgery (SSRF) through Distributed Search Peers in Splunk Enterp
CVE-2025-20385 2.4 LOW Stored Cross-Site scripting (XSS) through Anchor Tag "href" in Navigation Bar Collections

IV. Related Vulnerabilities

Same product: Splunk Enterprise
Same vendor: Splunk
Same weakness: CWE-732

V. Comments for CVE-2025-20387

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