CVE-2025-61752 Overview
CVE-2025-61752 is a Denial of Service vulnerability affecting the Oracle WebLogic Server product of Oracle Fusion Middleware. The vulnerability exists in the Core component and can be exploited by unauthenticated attackers with network access via HTTP/2. This flaw allows attackers to cause a complete denial of service condition, resulting in a hang or frequently repeatable crash of the WebLogic Server.
Critical Impact
Unauthenticated remote attackers can exploit this vulnerability via HTTP/2 to completely crash or hang Oracle WebLogic Server, disrupting critical business applications and services.
Affected Products
- Oracle WebLogic Server 14.1.1.0.0
- Oracle WebLogic Server 14.1.2.0.0
Discovery Timeline
- October 21, 2025 - CVE-2025-61752 published to NVD
- October 24, 2025 - Last updated in NVD database
Technical Details for CVE-2025-61752
Vulnerability Analysis
This vulnerability is classified under CWE-306 (Missing Authentication for Critical Function). The flaw resides in the Core component of Oracle WebLogic Server and specifically affects how the server handles HTTP/2 protocol requests. The vulnerability is easily exploitable, requiring no authentication or user interaction, making it particularly dangerous for internet-facing WebLogic deployments.
The attack vector is network-based, meaning any attacker with network access to the WebLogic Server's HTTP/2 endpoint can trigger the vulnerability. Successful exploitation results in a complete denial of service, either causing the server to hang or crash repeatedly, severely impacting availability of hosted applications.
Root Cause
The root cause stems from improper handling of HTTP/2 requests within the WebLogic Server Core component. The vulnerability is associated with missing authentication for critical functions (CWE-306), allowing unauthenticated requests to trigger resource exhaustion or crash conditions in the server's request processing logic.
Attack Vector
The attack is conducted remotely over the network via HTTP/2 protocol. An unauthenticated attacker sends specially crafted HTTP/2 requests to the vulnerable WebLogic Server. These requests exploit the flaw in the Core component's request handling, leading to a denial of service condition.
The vulnerability does not require any privileges or user interaction to exploit, making it accessible to any attacker with network connectivity to the target server. The impact is limited to availability—there is no confidentiality or integrity impact associated with this vulnerability.
Detection Methods for CVE-2025-61752
Indicators of Compromise
- Unexpected WebLogic Server crashes or hangs without apparent cause
- Increased HTTP/2 connection attempts from unknown or suspicious IP addresses
- Abnormal resource consumption patterns on WebLogic Server processes
- Repeated server restart events in system logs
Detection Strategies
- Monitor WebLogic Server access logs for unusual HTTP/2 traffic patterns
- Implement network-level monitoring for volumetric HTTP/2 requests targeting WebLogic endpoints
- Configure alerting on WebLogic Server process crashes or restarts
- Deploy intrusion detection signatures for known DoS attack patterns against WebLogic
Monitoring Recommendations
- Enable detailed logging for HTTP/2 connections on WebLogic Server
- Set up automated alerting for server availability and uptime monitoring
- Monitor CPU and memory utilization for WebLogic Server processes
- Track connection rates and identify anomalous spikes in HTTP/2 traffic
How to Mitigate CVE-2025-61752
Immediate Actions Required
- Apply the Oracle Critical Patch Update (CPU) for October 2025 immediately
- Restrict network access to WebLogic Server management interfaces and HTTP/2 endpoints
- Consider disabling HTTP/2 protocol if not required for business operations
- Implement rate limiting on HTTP/2 connections at the network perimeter
Patch Information
Oracle has addressed this vulnerability in the October 2025 Critical Patch Update. Administrators should review the Oracle Critical Patch Update Advisory for detailed patching instructions and download the appropriate security patches for WebLogic Server versions 14.1.1.0.0 and 14.1.2.0.0.
Workarounds
- Disable HTTP/2 protocol support in WebLogic Server configuration if not actively required
- Deploy a Web Application Firewall (WAF) to filter malicious HTTP/2 requests
- Implement network segmentation to limit exposure of WebLogic Server to trusted networks only
- Configure load balancers with connection rate limiting and health checks
# Example: Restricting access to WebLogic Server via iptables
# Limit HTTP/2 connections from untrusted networks
iptables -A INPUT -p tcp --dport 7001 -m connlimit --connlimit-above 50 -j DROP
iptables -A INPUT -p tcp --dport 7002 -m connlimit --connlimit-above 50 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
