CVE-2025-20322
📋 TL;DR
This CSRF vulnerability in Splunk Enterprise and Cloud Platform allows unauthenticated attackers to trigger rolling restarts in Search Head Clusters by tricking administrators into executing malicious SPL search commands. This can cause denial of service through service disruption. Organizations running affected Splunk versions without proper CSRF protections are vulnerable.
💻 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
Sustained DoS through repeated rolling restarts causing extended service unavailability, impacting monitoring, alerting, and security operations.
Likely Case
Temporary service disruption during rolling restarts, causing search delays and potential data ingestion gaps until cluster stabilizes.
If Mitigated
Minimal impact with proper CSRF protections, network segmentation, and administrator awareness training.
🎯 Exploit Status
Exploitation requires social engineering to trick administrator into executing malicious request; cannot be exploited at will without victim interaction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Splunk Enterprise: 9.4.3, 9.3.5, 9.2.7, 9.1.10; Splunk Cloud Platform: 9.3.2411.104, 9.3.2408.113, 9.2.2406.119
Vendor Advisory: https://advisory.splunk.com/advisories/SVD-2025-0705
Restart Required: Yes
Instructions:
1. Backup Splunk configuration and data. 2. Download appropriate patched version from Splunk website. 3. Stop Splunk services. 4. Install update following Splunk upgrade documentation. 5. Restart services and verify functionality.
🔧 Temporary Workarounds
CSRF Protection Enforcement
allEnsure CSRF tokens are required for all state-changing operations in Splunk web interface
Verify CSRF protection is enabled in web.conf: enableCSRFProtection = true
Network Segmentation
allRestrict access to Splunk web interface to trusted networks only
Configure firewall rules to limit access to Splunk ports (default 8000) to authorized IP ranges
🧯 If You Can't Patch
- Implement strict network access controls to limit Splunk web interface exposure
- Train administrators to recognize phishing attempts and avoid executing untrusted SPL commands
🔍 How to Verify
Check if Vulnerable:
Check Splunk version via web interface (Settings > Server Info) or CLI: splunk versionCheck Version:
splunk versionVerify Fix Applied:
Confirm version is at or above patched versions listed in advisory📡 Detection & Monitoring
Log Indicators:
- Unexpected rolling restart events in splunkd.log
- Multiple search head cluster member restarts within short timeframe
- CSRF token validation failures in web_access.log
Network Indicators:
- Unusual SPL search requests from unexpected sources
- Multiple POST requests to search endpoints without proper referrer headers
SIEM Query:
index=_internal source=*splunkd.log "rolling restart" OR "SHC restart" | stats count by host, user