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CVE-2025-20387 is a high-severity local privilege-escalation vulnerability in Splunk Universal Forwarder for Windows. In affected versions below 10.0.2, 9.4.6, 9.3.8, and 9.2.10, a new installation or upgrade can assign incorrect NTFS permissions to the Universal Forwarder installation directory. As a result, non-administrator local users may gain access to the directory and its contents, including binaries, configuration files, scripts, and other resources that should be protected. Because Splunk service components on Windows typically run with elevated privileges, an attacker with local access may be able to tamper with files loaded or executed by those services and thereby escalate privileges. The issue is consistent with incorrect permission assignment for a critical resource.
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No public exploit code observed for this vulnerability.
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A vulnerability in Splunk. Details not specified in the content.
A local privilege escalation vulnerability in Splunk Universal Forwarder for Windows caused by misconfigured/overly permissive NTFS ACLs on default install directories, enabling authenticated low-privilege users to tamper with files loaded by elevated Splunk services and escalate to SYSTEM.
A high-severity vulnerability in Splunk Universal Forwarder for Windows where incorrect permissions are assigned to the installation directory during installation or upgrade, allowing non-administrator users local access to the directory and its contents.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.