CVE-2025-20387: Splunk Enterprise · The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.
Affects Splunk EnterpriseSource CVE Database V5
Not known to be exploited · CVSS 8.0 High.
Data as of 26 Oct 2026, 14:05 UTC
- EPSS
- 0.4% chance of exploitation in 30 days – higher than 42% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 3 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Splunk Splunk Enterprise | Affected
| Fixed in– |
AI-suggested
- Immediately upgrade Splunk Universal Forwarder for Windows to versions 10.0.2, 9.4.6, 9.3.8, or 9.2.10 where the vulnerability is fixed.
- After installation or upgrade, manually verify and correct NTFS permissions on the Universal Forwarder installation directory to restrict access strictly to administrators and the Splunk service account.
- Implement strict local user account management policies to limit the number of users with local access on systems running Splunk Universal Forwarder.
- Use application whitelisting and endpoint protection to detect unauthorized modifications to Splunk files.
- Monitor file integrity of Splunk installation directories using host-based intrusion detection systems (HIDS).
- Educate system administrators to be cautious during upgrades and to validate permissions post-upgrade.
- Where possible, isolate Splunk Universal Forwarder hosts to minimize exposure to untrusted users.
- Review and harden Windows security policies related to file system permissions and user rights assignments.
- Maintain up-to-date backups of Splunk configurations and logs to enable recovery in case of tampering.
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.