CVE-2025-20387: splunk Permission Flaw — Fix

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.

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CVSS v3.1 Score

8.0

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-732 CWE-732

Affected Products

Vendor	Product	Versions
splunk	splunk	9.2.0 — 9.2.10
splunk	splunk	9.3.0 — 9.3.8
splunk	splunk	9.4.0 — 9.4.6
splunk	splunk	10.0.0 — 10.0.2

References

Advisories & Patches

https://advisory.splunk.com/advisories/SVD-2025-1206

Frequently Asked Questions

What is CVE-2025-20387? +

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. It has a CVSS v3.1 base score of 8.0 (HIGH).

How severe is CVE-2025-20387? +

CVE-2025-20387 has a CVSS v3.1 score of 8.0 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-20387? +

CVE-2025-20387 affects products from splunk, specifically: splunk. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-20387? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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