CVE-2025-20300
📋 TL;DR
In affected Splunk Enterprise and Cloud Platform versions, a low-privileged user with read-only access to a specific alert can suppress that alert when it triggers. This allows users without admin or power roles to interfere with alert functionality. Organizations using vulnerable Splunk versions are affected.
💻 Affected Systems
- Splunk Enterprise
- Splunk Cloud Platform
📦 What is this software?
Splunk by Splunk
Splunk by Splunk
Splunk by Splunk
Splunk by Splunk
⚠️ Risk & Real-World Impact
Worst Case
Critical security alerts could be suppressed, allowing malicious activity to go undetected while appearing to have functional monitoring.
Likely Case
Accidental or intentional suppression of operational or security alerts, reducing monitoring effectiveness.
If Mitigated
Limited impact if proper role-based access controls and alert monitoring are implemented.
🎯 Exploit Status
Exploitation requires authenticated access and knowledge of specific alert configurations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Splunk Enterprise 9.4.2, 9.3.5, 9.2.6, 9.1.9; Splunk Cloud Platform 9.3.2411.103, 9.3.2408.112, 9.2.2406.119
Vendor Advisory: https://advisory.splunk.com/advisories/SVD-2025-0708
Restart Required: Yes
Instructions:
1. Download appropriate patch version from Splunk downloads portal. 2. Backup Splunk configuration and data. 3. Stop Splunk services. 4. Apply patch following Splunk upgrade documentation. 5. Restart Splunk services. 6. Verify version and functionality.
🔧 Temporary Workarounds
Restrict Alert Access
allLimit read-only access to alerts for low-privileged users
Implement Alert Monitoring
allMonitor alert suppression activities in audit logs
🧯 If You Can't Patch
- Review and restrict user permissions for alert access
- Implement additional monitoring for alert suppression activities
🔍 How to Verify
Check if Vulnerable:
Check Splunk version via web interface or CLI: splunk versionCheck Version:
splunk versionVerify Fix Applied:
Verify version is at or above patched versions and test alert suppression with low-privileged user📡 Detection & Monitoring
Log Indicators:
- Audit logs showing alert suppression by non-admin users
- Changes to alert suppression settings
Network Indicators:
- API calls to alert suppression endpoints from non-privileged accounts
SIEM Query:
index=_audit action=suppress_alert user!=admin user!=power