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VulnerabilityPublished Updated

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

0

Not known to be exploited · CVSS 8.0 High.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score
8.0High
How severe the flaw is on the 0–10 CVSS scale.
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:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Dec 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
Splunk Splunk EnterpriseAffected
  • 9.2 – 10.0
4 affected builds
Fixed in–

AI-suggested

  1. 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.
  2. 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.
  3. Implement strict local user account management policies to limit the number of users with local access on systems running Splunk Universal Forwarder.
  4. Use application whitelisting and endpoint protection to detect unauthorized modifications to Splunk files.
  5. Monitor file integrity of Splunk installation directories using host-based intrusion detection systems (HIDS).
  6. Educate system administrators to be cautious during upgrades and to validate permissions post-upgrade.
  7. Where possible, isolate Splunk Universal Forwarder hosts to minimize exposure to untrusted users.
  8. Review and harden Windows security policies related to file system permissions and user rights assignments.
  9. 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.

References

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