How severe is CVE-2025-20387?

CVE-2025-20387 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-20387 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-20387?

CVE-2025-20387 affects Splunk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-20387?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-20387 have an EU (EUVD) identifier?

Yes. CVE-2025-20387 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-200997.

When was CVE-2025-20387 published?

CVE-2025-20387 was published on 2025-12-03 and last updated on 2026-06-17.

CVE-2025-20387

CVE-2025-20387 is a high-severity vulnerability in Splunk with a CVSS 3.x base score of 8.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-732.

Key facts

Severity: High (CVSS 3.x base score 8.0)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-200997
Weakness: CWE-732
Affected product: Splunk
Published: 2025-12-03
Last modified: 2026-06-17

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.

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.
How severe is CVE-2025-20387?: CVE-2025-20387 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-20387 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-20387?: CVE-2025-20387 affects Splunk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-20387?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-20387 have an EU (EUVD) identifier?: Yes. CVE-2025-20387 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-200997.
When was CVE-2025-20387 published?: CVE-2025-20387 was published on 2025-12-03 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:splunk:splunk:*:*:*:*:enterprise:*:*:*

More vulnerabilities in Splunk

CVE-2026-20253 — Critical (CVSS 9.8): In Splunk Enterprise 10.2 versions below 10.2.4 and 10 versions below 10.0.7, an unauthenticated user could create or…
CVE-2017-17067 — Critical (CVSS 9.8): Splunk Web in Splunk Enterprise 7.0.x before 7.0.0.1, 6.6.x before 6.6.3.2, 6.5.x before 6.5.6, 6.4.x before 6.4.9, and…
CVE-2016-10126 — Critical (CVSS 9.8): Splunk Web in Splunk Enterprise 5.0.x before 5.0.17, 6.0.x before 6.0.13, 6.1.x before 6.1.12, 6.2.x before 6.2.12,…
CVE-2013-6771 — Critical (CVSS 9.3): Directory traversal vulnerability in the collect script in Splunk before 5.0.5 allows remote attackers to execute…
CVE-2011-4644 — Critical (CVSS 9.3): Splunk 4.2.5 and earlier, when a Free license is selected, enables potentially undesirable functionality within an…
CVE-2022-32158 — Critical (CVSS 9.0): Splunk Enterprise deployment servers in versions before 8.1.10.1, 8.2.6.1, and 9.0 let clients deploy forwarder bundles…

All CVEs affecting Splunk →

Other CWE-732 (Incorrect Permission Assignment for Critical Resource) vulnerabilities

CVE-2026-9508 — Critical (CVSS 10.0): Incorrect permission settings on a critical resource in Suprema BioStar 2 (versions 2.9.3 through 2.9.11) that allow…
CVE-2025-14988 — Critical (CVSS 10.0): A security issue has been identified in ibaPDA that could allow unauthorized actions on the file system under certain…
CVE-2025-69426 — Critical (CVSS 10.0): The Ruckus vRIoT IoT Controller firmware versions prior to 3.0.0.0 (GA) contain hardcoded credentials for an operating…
CVE-2025-12004 — Critical (CVSS 10.0): Incorrect Permission Assignment for Critical Resource vulnerability in The Wikimedia Foundation Mediawiki - Lockdown…
CVE-2014-125121 — Critical (CVSS 10.0): Array Networks vAPV (version 8.3.2.17) and vxAG (version 9.2.0.34) appliances are affected by a privilege escalation…
CVE-2025-46093 — Critical (CVSS 9.9): LiquidFiles before 4.1.2 supports FTP SITE CHMOD for mode 6777 (setuid and setgid), which allows FTPDrop users to…

Browse all CWE-732 (Incorrect Permission Assignment for Critical Resource) vulnerabilities →