What is CVE-2025-20387?

CVE-2025-20387 is a high-severity vulnerability in Splunk, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 8.0/10. Published 2025-12-03.

How severe is CVE-2025-20387?

High severity. CVSS v3 base score is 8.0 out of 10.

Vulnerability in Splunk

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.

EPSS: 0.005 (39.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

Affected products

Splunk
Splunk Enterprise — versions 10.0, 9.4, 9.3

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

psirt@cisco.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-20387?: CVE-2025-20387 is a high-severity vulnerability in Splunk, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 8.0/10. Published 2025-12-03.
How severe is CVE-2025-20387?: High severity. CVSS v3 base score is 8.0 out of 10.