CVE-2026-20062 is a vulnerability in the CLI of Cisco Secure Firewall ASA Software when operating in multiple context mode, which partitions the device into multiple virtual firewalls. The flaw is due to incorrect execution-assigned permissions related to Secure Copy Protocol (SCP) operations handled by the CiscoSSH stack. An attacker who is authenticated locally with administrative privileges in a non-admin context can exploit this by issuing crafted SCP copy commands to copy files to or from other contexts, including the admin and system contexts. This improper access control allows unauthorized reading, creation, or overwriting of sensitive files across contexts. However, the attacker cannot list or enumerate files in other contexts, requiring knowledge of exact file paths, which raises exploitation complexity. The vulnerability does not enable direct disruption of services (availability) in other contexts but severely impacts confidentiality and integrity of data. It affects a wide range of ASA software versions from 9.17.1 to 9.23.1.3. The CVSS v3.1 score is 7.2 (high severity), reflecting local attack vector, high privileges required, no user interaction, and significant confidentiality and integrity impact. No public exploits have been reported yet, but the vulnerability poses a serious risk in environments using multi-context ASA deployments with CiscoSSH enabled.

The primary impact of CVE-2026-20062 is unauthorized access and modification of sensitive files across different security contexts within Cisco ASA devices. This can lead to exposure of confidential configuration data, potential manipulation of firewall rules, and compromise of system integrity. Organizations relying on multi-context ASA deployments for network segmentation and security isolation may find these boundaries breached, undermining their security posture. Although availability is not directly affected, the confidentiality and integrity breaches could facilitate further attacks, lateral movement, or persistent compromise. The requirement for administrative credentials in a non-admin context limits the attack surface but insider threats or credential compromise scenarios significantly increase risk. Given the widespread use of Cisco ASA devices in enterprise, government, and critical infrastructure networks globally, this vulnerability could have far-reaching consequences if exploited, including data breaches, regulatory non-compliance, and operational disruptions.

1. Apply Cisco's security patches or updates for ASA software versions addressing CVE-2026-20062 as soon as they become available. 2. Restrict SCP usage and disable CiscoSSH stack if not required, or limit SCP operations to trusted administrators only. 3. Enforce strict access controls and segmentation between contexts, ensuring minimal administrative privileges are granted per context. 4. Monitor and audit SCP command usage and file access logs for suspicious activity indicative of cross-context file operations. 5. Implement multi-factor authentication for administrative access to reduce risk of credential compromise. 6. Educate administrators about the risks of credential sharing and the importance of context-specific privilege separation. 7. Consider deploying network-level controls to detect anomalous SCP traffic patterns. 8. Regularly review and update firewall configurations to ensure no unnecessary exposure of management interfaces. These steps go beyond generic advice by focusing on limiting SCP usage, enhancing monitoring, and enforcing strict privilege boundaries within multi-context ASA deployments.