A vulnerability in Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, local attacker to cause the device to unexpectedly reload, causing a denial of service (DoS) condition. This vulnerability is due to improper validation of user-supplied input. An attacker with a low-privileged account could exploit this vulnerability by using crafted commands at the CLI prompt. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
The CVSS score for this vulnerability is 6.5, indicating a medium severity level. Organizations should address this issue in their priority patch cycle to mitigate potential risks. The nature of this vulnerability presents a risk to organizations, as attackers may leverage it to disrupt services and affect operational continuity.
As of now, there are no known public exploits associated with this vulnerability, but it is essential for organizations to remain vigilant and implement the necessary updates to their systems.
Organizations should prioritize patching immediately, as the potential impact of a DoS condition can affect business operations significantly.
Vulnerability Details
CVE-2026-20064 is classified as a vulnerability that allows a local attacker to induce a DoS condition through improper validation of user input. The CVSS 3.1 vector indicates that the attack vector is local, with low complexity and low privileges required for exploitation.
The affected system is Cisco Firepower Threat Defense Software, with specific versions such as 6.2.3 and various 6.4.x and 7.x releases being vulnerable as noted in the configurations section.
Technical Analysis
The root cause of this vulnerability lies in the improper validation of input provided by users. The attack vector is local, requiring the attacker to have access to the system. The attack complexity is low, allowing exploitation without significant effort. Privileges required are low, meaning even users with minimal access can potentially exploit this vulnerability.
User interaction is not required for exploitation, and the impact on availability is high, as the vulnerability can lead to a complete system reload, resulting in service disruption. Confidentiality and integrity impacts are noted as none.
Risk & Impact Analysis
Risk to organizations includes potential downtime and service interruptions, which can affect customer satisfaction and operational efficiency. The availability impact of this vulnerability is categorized as high, making it critical for organizations to address it promptly.
Given the CVSS score of 6.5 and the lack of known active exploitation, organizations should still treat this vulnerability with urgency and incorporate remediation strategies into their security plans.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Cisco Firepower Threat Defense Software are affected: 6.2.3, 6.4.0 through 6.4.18, 7.0.0 through 7.7.10. Organizations running these versions should take immediate actions to remediate this vulnerability.
Mitigation & Remediation
Organizations should review their current versions of Cisco Firepower Threat Defense Software and apply the latest patches provided by Cisco. For those unable to immediately patch, implementing access controls and monitoring for unusual CLI commands may help mitigate the risks associated with this vulnerability. Continuous security testing can also help uncover potential vulnerabilities and weaknesses in the system.
Detection Guidance
Organizations should monitor logs for any indicators of exploitation attempts. Behavioral anomalies in CLI commands executed by low-privileged users can also be indicative of attempts to exploit this vulnerability. Network signatures can aid in identifying unusual traffic patterns that may suggest an ongoing attack.
AppSecure Threat Intelligence Insight
CVE-2026-20064 reflects a significant concern for organizations using Cisco Firepower Threat Defense Software. The potential for denial of service attacks emphasizes the need for vigilance in patch management and security oversight. Continuous monitoring and security assessments, such as continuous security testing can help organizations identify vulnerabilities proactively and strengthen their defenses.
The pattern of vulnerabilities that affect local access demonstrates the importance of controlling user privileges and monitoring command usage in network devices. Organizations should also consider developing a comprehensive penetration testing strategy to regularly assess their security posture and mitigate potential risks.
In conclusion, addressing CVE-2026-20064 should be a priority for organizations utilizing Cisco Firepower Threat Defense Software. By implementing effective remediation strategies and maintaining security best practices, organizations can significantly reduce their exposure to potential attacks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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