CVE-2025-22891 in BIG-IP
Summary
by MITRE • 02/05/2025
When BIG-IP PEM Control Plane listener Virtual Server is configured with Diameter Endpoint profile, undisclosed traffic can cause the Virtual Server to stop processing new client connections and an increase in memory resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
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Analysis
by VulDB Data Team • 08/06/2025
The vulnerability identified as CVE-2025-22891 affects F5 BIG-IP PEM Control Plane listener Virtual Servers when configured with Diameter Endpoint profile functionality. This represents a critical denial of service condition that can severely impact network infrastructure availability and performance. The issue manifests when the system processes undisclosed traffic patterns that trigger abnormal behavior in the virtual server's connection handling mechanisms. From a cybersecurity perspective, this vulnerability aligns with CWE-400 which encompasses improper handling of resource consumption, specifically memory utilization and connection processing. The affected system operates within the realm of application delivery controllers where maintaining continuous service availability is paramount for business operations.
The technical flaw stems from inadequate input validation and resource management within the Diameter Endpoint profile implementation. When processing specific traffic patterns that are not properly defined or documented, the virtual server experiences a degradation in its ability to accept new client connections. This occurs alongside an abnormal increase in memory resource utilization, suggesting that the system fails to properly release memory resources or handle exceptional conditions during traffic processing. The vulnerability demonstrates characteristics consistent with CWE-129 which addresses improper validation of input boundaries, and CWE-134 which covers use of potentially dangerous functions that can lead to resource exhaustion. The underlying mechanism likely involves insufficient error handling in the connection establishment process where malformed or unexpected Diameter protocol messages cause the system to enter an unstable state.
Operationally, this vulnerability presents significant risks to organizations relying on F5 BIG-IP systems for critical network services. The denial of service condition can result in complete loss of connectivity for clients attempting to establish new connections through the affected virtual server, potentially disrupting authentication services, session management, or other Diameter-based protocols. The memory utilization increase indicates that the system may eventually become unresponsive or require manual intervention to restore normal operations. Network administrators face the challenge of identifying the specific traffic patterns that trigger this behavior without comprehensive documentation, making proactive detection and mitigation difficult. This vulnerability directly impacts the availability aspect of the CIA triad and can be categorized under ATT&CK technique T1499 which involves network disruption attacks targeting availability.
Mitigation strategies should focus on immediate software updates from F5 to address the specific implementation flaw in the Diameter Endpoint profile handling. Organizations should implement network segmentation to isolate affected virtual servers and monitor for unusual connection patterns or memory usage spikes that may indicate exploitation attempts. The implementation of connection rate limiting and traffic filtering rules can help reduce the impact of potentially malicious traffic patterns. Additionally, system administrators should establish monitoring protocols specifically designed to detect abnormal memory consumption patterns and connection processing failures. Configuration reviews should ensure that Diameter Endpoint profiles are only enabled when absolutely necessary and that proper access controls are implemented to limit exposure. Organizations should also consider implementing intrusion detection systems that can identify and alert on suspicious Diameter protocol traffic patterns that may trigger the vulnerability. The remediation process must include thorough testing of updated firmware to ensure that the fix does not introduce compatibility issues with existing network services while maintaining the overall system stability and performance requirements.