CVE-2025-24326 in BIG-IP
Summary
by MITRE • 02/05/2025
When BIG-IP Advanced WAF/ASM Behavioral DoS (BADoS) TLS Signatures feature is configured, undisclosed traffic can case 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 • 08/08/2025
The vulnerability identified as CVE-2025-24326 affects F5 BIG-IP Advanced WAF/ASM Behavioral DoS TLS Signatures feature, representing a memory resource exhaustion issue that can be exploited through undisclosed traffic patterns. This vulnerability resides within the Advanced WAF/ASM module's Behavioral DoS implementation, specifically targeting the TLS signature processing mechanism. The flaw manifests when the system processes certain traffic patterns that trigger the BADoS feature, leading to abnormal memory consumption that can ultimately result in system instability or resource exhaustion. The vulnerability impacts the core functionality of the BIG-IP system's security enforcement capabilities, potentially compromising the availability of services protected by the Advanced WAF/ASM module.
The technical implementation of this vulnerability stems from inadequate input validation and memory management within the TLS signature processing pipeline of the BADoS feature. When legitimate traffic patterns trigger the behavioral detection mechanisms, the system fails to properly handle memory allocation for signature processing, leading to progressive memory consumption. The undisclosed nature of the specific traffic patterns suggests that the vulnerability may be triggered by subtle variations in TLS handshake sequences or certificate processing that are not immediately obvious to administrators. This type of vulnerability aligns with CWE-129, which covers improper handling of memory resources, and may also relate to CWE-772, concerning missing resource cleanup or release after use. The root cause likely involves insufficient bounds checking or memory allocation limits within the TLS signature validation routines that are part of the behavioral detection framework.
The operational impact of CVE-2025-24326 extends beyond simple memory consumption issues to potentially compromise the availability and integrity of security services provided by the BIG-IP system. When memory utilization increases progressively due to this vulnerability, it can lead to system performance degradation, service disruption, or complete system unavailability. Network administrators may experience unexpected system slowdowns or crashes during periods of normal traffic, making the issue particularly dangerous in production environments where service availability is critical. The vulnerability can be exploited remotely without requiring authentication, making it a significant concern for organizations that rely on BIG-IP systems for their web application security. This attack vector aligns with ATT&CK technique T1499.004, which covers resource exhaustion attacks targeting availability, and may also involve T1595.001 for reconnaissance activities that identify vulnerable configurations.
Mitigation strategies for CVE-2025-24326 should focus on immediate configuration adjustments and system monitoring to prevent exploitation. Organizations should disable the problematic BADoS TLS Signatures feature until a patch is available, which aligns with the principle of least privilege and reduces attack surface. System administrators should implement enhanced monitoring of memory utilization metrics, particularly during peak traffic periods, to detect early signs of the vulnerability exploitation. Network segmentation and access controls should be strengthened to limit potential attack vectors, while regular security assessments should be conducted to identify similar vulnerabilities in the BIG-IP configuration. The vulnerability also highlights the importance of maintaining up-to-date security patches and following vendor security advisories, as this issue may be indicative of broader security concerns within the F5 BIG-IP platform. Regular vulnerability scanning and penetration testing should be implemented to identify potential exploitation paths, and incident response procedures should be updated to address memory exhaustion attacks specifically. Organizations should also consider implementing network traffic analysis tools to monitor for the specific traffic patterns that may trigger this vulnerability, enabling proactive threat detection and response capabilities.