A vulnerability in the handling of the embryonic connection limits in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause incoming TCP SYN packets to be dropped incorrectly. This vulnerability is due to improper handling of new, incoming TCP connections that are destined to management or data interfaces when the device is under a TCP SYN flood attack. An attacker could exploit this vulnerability by sending a crafted stream of traffic to an affected device. A successful exploit could allow the attacker to prevent all incoming TCP connections to the device from being established, including remote management access, Remote Access VPN (RAVPN) connections, and all network protocols that are TCP-based. This results in a denial of service (DoS) condition for affected features.
The severity of this vulnerability is classified as high, with a CVSS score of 8.6. The risk to organizations includes potential denial of service, severely impacting the availability of services that rely on TCP connections. Organizations should prioritize patching immediately to mitigate this risk.
Currently, the vulnerability is undergoing analysis, and there is no confirmed public exploit available. However, the potential for exploitation remains a concern, making it vital for organizations using affected Cisco products to be vigilant and prepared for potential attacks.
With the increasing frequency of TCP SYN flood attacks, the urgency for organizations to address this vulnerability cannot be overstated. Immediate remediation and monitoring for suspicious traffic patterns are essential to protect network integrity.
Vulnerability Details
The vulnerability allows attackers to disrupt service by dropping TCP SYN packets, which are essential for establishing TCP connections. The CVSS score of 8.6 indicates a high severity, highlighting the need for prompt action.
Technical Analysis
The root cause of the vulnerability stems from improper handling of incoming TCP connections. During a TCP SYN flood attack, the device fails to manage new connections properly, allowing an attacker to exploit this weakness.
This vulnerability is exploitable over the network with low attack complexity and no privileges required. User interaction is not necessary, which increases the risk of successful exploitation. The availability impact is categorized as high, as it affects all TCP-based services.
Risk & Impact Analysis
Organizations face significant risk from this vulnerability, especially those relying on Cisco Secure Firewall ASA for critical services. The potential to disrupt remote management access and VPN connections could lead to operational downtime and financial losses.
The urgency of this vulnerability is compounded by its high CVSS score and the increasing prevalence of TCP SYN flood attacks. Organizations should address this vulnerability in their priority patch cycle to safeguard their networks.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch are affected by this vulnerability.
Mitigation & Remediation
Organizations should apply available patches from Cisco to remediate this vulnerability. If a patch is not available, consider implementing network controls to limit exposure to TCP SYN flood attacks. Organizations should schedule remediation as a high priority.
Detection Guidance
Monitor logs for unusual TCP connection attempts and SYN flood patterns. Behavioral anomalies may indicate attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
This vulnerability highlights the ongoing risk associated with improper handling of TCP connections in network devices. Security teams should review existing protections against SYN flood attacks and ensure they are effective. For more information on defensive strategies, organizations can explore our resources on penetration testing and application security assessments to strengthen their defenses against similar vulnerabilities in the future.
Organizations should also stay informed about ongoing security trends and implement best practices as outlined in our vulnerability exposure severity trends report to proactively manage risks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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