A vulnerability in the SIP processing subsystem of Cisco BroadWorks could allow an unauthenticated, remote attacker to halt the processing of incoming SIP requests, resulting in a denial of service (DoS) condition. This vulnerability is due to improper memory handling for certain SIP requests. An attacker could exploit this vulnerability by sending a high number of SIP requests to an affected system. A successful exploit could allow the attacker to exhaust the memory that was allocated to the Cisco BroadWorks Network Servers that handle SIP traffic. If no memory is available, the Network Servers can no longer process incoming requests, resulting in a DoS condition that requires manual intervention to recover.
The CVSS score for this vulnerability is 7.5, categorized as high severity. This classification indicates significant risk to organizations, as the attack vector is network-based with low complexity and no privileges or user interaction required, leading to a high impact on availability.
Organizations should prioritize patching immediately to mitigate the risks associated with this vulnerability. Regular updates and monitoring of network traffic for unusual patterns are essential to enhance security posture.
As of now, there are no known public exploits or proof-of-concept (PoC) available for this vulnerability. However, the potential for exploitation exists, necessitating vigilance from security teams.
Vulnerability Details
The vulnerability stems from improper memory handling for certain SIP requests within the Cisco BroadWorks system. This issue is classified under CWE-789, indicating an improper resource management flaw. The vulnerability affects all versions of the Cisco BroadWorks Network Server prior to release 2024.11.
The vulnerability was published on January 22, 2025, and has been analyzed by Cisco's PSIRT team, with the status being actively monitored.
Technical Analysis
The root cause of this vulnerability is the system's failure to correctly manage memory allocation for incoming SIP requests. Attackers may leverage this vulnerability through network-based attacks, sending a large volume of SIP requests to the affected servers. The attack complexity is low, requiring no specific privileges or user interaction, thus making it easier for an attacker to execute.
In terms of impact, the vulnerability poses a high risk to availability as the servers become unable to process requests when memory is exhausted. This leads to a denial of service condition that requires manual recovery actions to restore normal operations.
Risk & Impact Analysis
Risk to organizations includes potential downtime of critical services reliant on Cisco BroadWorks, leading to significant operational disruption. The blast radius of this vulnerability could affect all users accessing services through the affected Network Servers.
Given the CVSS score of 7.5 and the potential for exploitation, organizations should address this vulnerability in their priority patch cycle. Continuous monitoring for unusual SIP request patterns can also help mitigate the impact.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of Cisco BroadWorks Network Server prior to release 2024.11. Organizations using these versions should take immediate action to remediate the vulnerability.
Mitigation & Remediation
Organizations should prioritize patching the affected systems. The recommended version to upgrade to is 2024.11 or later. If patching is not immediately possible, consider implementing network controls to limit SIP request traffic and monitor for unusual patterns. Configuration hardening and regular security assessments can also play a crucial role in reducing exposure.
For organizations seeking to validate their security posture, engaging in penetration testing can help identify and remediate similar vulnerabilities.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor for unusual SIP request patterns and check server logs for anomalies. Behavioral anomalies in SIP processing should be flagged for further investigation. Additionally, network signatures related to SIP traffic can be established to assist in identifying potential threats.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-20165 highlights the critical importance of proper memory management in network services. This incident underscores a growing trend in vulnerabilities related to SIP processing, which could lead to widespread disruptions in communication services.
Organizations should learn from this vulnerability and implement robust security measures, including regular updates and security assessments. Understanding the patterns of such vulnerabilities can help in developing proactive defensive strategies.
For further reading on enhancing security practices, consider reviewing our resources on penetration testing methodology and the importance of a vulnerability management program to strengthen your overall security posture.
Engaging with security experts can also provide valuable insights into securing your infrastructure against emerging threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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