CVE-2025-61752
📋 TL;DR
An unauthenticated remote attacker can exploit this vulnerability in Oracle WebLogic Server via HTTP/2 to cause a denial of service, resulting in server crashes or hangs. This affects Oracle WebLogic Server 14.1.1.0.0 and 14.1.2.0.0 running in Oracle Fusion Middleware environments.
💻 Affected Systems
- Oracle WebLogic Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete unavailability of WebLogic Server, disrupting all applications and services hosted on it.
Likely Case
Frequent server crashes requiring manual restarts, causing significant service disruption.
If Mitigated
Limited impact if network access is restricted and proper monitoring is in place.
🎯 Exploit Status
CVSS describes as 'easily exploitable' with low attack complexity. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply patches from Oracle Critical Patch Update October 2025
Vendor Advisory: https://www.oracle.com/security-alerts/cpuoct2025.html
Restart Required: Yes
Instructions:
1. Download appropriate patches from Oracle Support. 2. Apply patches following Oracle's patch installation procedures. 3. Restart WebLogic Server instances. 4. Verify patch application.
🔧 Temporary Workarounds
Disable HTTP/2
allTemporarily disable HTTP/2 protocol support to prevent exploitation via this vector
Modify WebLogic Server configuration to disable HTTP/2 protocol support
Network Access Control
allRestrict network access to WebLogic Server administration ports
Configure firewall rules to limit access to trusted IP addresses only
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to limit access to WebLogic Server
- Deploy Web Application Firewall (WAF) with DoS protection rules and monitor for attack patterns
🔍 How to Verify
Check if Vulnerable:
Check WebLogic Server version via console or command line. If running 14.1.1.0.0 or 14.1.2.0.0, system is vulnerable.Check Version:
java weblogic.versionVerify Fix Applied:
Verify patch application through Oracle patch management tools and confirm version is no longer in vulnerable range.📡 Detection & Monitoring
Log Indicators:
- Unexpected server crashes or hangs
- HTTP/2 protocol errors
- Increased error rates in server logs
Network Indicators:
- Unusual HTTP/2 traffic patterns
- Multiple connection attempts from single sources
SIEM Query:
source="weblogic" AND (event_type="crash" OR event_type="hang" OR error_message="HTTP/2")