CVE-2025-22166
📋 TL;DR
This high-severity Denial of Service vulnerability in Confluence Data Center allows attackers to make resources unavailable to legitimate users by disrupting services. It affects Confluence Data Center and Server versions starting from 2.0, with specific vulnerable versions in the 8.5, 9.2, and 10.0 branches.
💻 Affected Systems
- Confluence Data Center
- Confluence Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption making Confluence unavailable to all users, potentially requiring service restart and causing extended downtime.
Likely Case
Temporary service degradation or unavailability affecting user productivity and collaboration workflows.
If Mitigated
Minimal impact with proper network segmentation and access controls limiting attack surface.
🎯 Exploit Status
Based on CVSS score of 8.3 and DoS nature, exploitation likely requires minimal technical skill. No public exploit code identified at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.5.25, 9.2.7, or 10.0.2 depending on current version
Vendor Advisory: https://confluence.atlassian.com/pages/viewpage.action?pageId=1652920034
Restart Required: Yes
Instructions:
1. Backup your Confluence instance and database. 2. Download appropriate fixed version from Atlassian download center. 3. Stop Confluence service. 4. Apply patch/upgrade. 5. Restart Confluence service. 6. Verify functionality.
🔧 Temporary Workarounds
Network Access Restriction
allLimit access to Confluence instances to trusted IP addresses only
# Configure firewall rules to restrict access
# Example: iptables -A INPUT -p tcp --dport 8090 -s trusted_ip_range -j ACCEPT
# iptables -A INPUT -p tcp --dport 8090 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to limit access to Confluence instances
- Deploy rate limiting and DoS protection mechanisms at network perimeter
🔍 How to Verify
Check if Vulnerable:
Check Confluence version via Administration → General Configuration → System Information, or run: grep -i 'confluence.version' confluence/WEB-INF/classes/confluence-init.propertiesCheck Version:
grep -i 'confluence.version' confluence/WEB-INF/classes/confluence-init.propertiesVerify Fix Applied:
Verify version is 8.5.25+, 9.2.7+, or 10.0.2+ and monitor for service stability📡 Detection & Monitoring
Log Indicators:
- Unusual traffic patterns
- Service restart events
- High resource utilization alerts
- Connection spikes from single sources
Network Indicators:
- Abnormal request patterns to Confluence endpoints
- Traffic spikes from unexpected sources
- Repeated connection attempts
SIEM Query:
source="confluence.log" AND ("service unavailable" OR "out of memory" OR "connection refused")