CVE-2025-1547 is a stack-based buffer overflow vulnerability (CWE-121) identified in the certificate request command of WatchGuard Fireware OS, versions 12.0 through 12.5.12+701324 and 12.6 through 12.11.2. This vulnerability allows an authenticated user with high privileges to execute arbitrary code by sending specially crafted CLI commands. The flaw stems from insufficient bounds checking on input data within the certificate request functionality, leading to memory corruption on the stack. Successful exploitation can result in full compromise of the device, enabling attackers to execute arbitrary code with elevated privileges, potentially leading to control over network traffic, bypassing security policies, or causing denial of service. The attack vector is network-based, but requires authentication with privileged access, and no user interaction is needed. The CVSS v4.0 score of 7.5 reflects the high impact on confidentiality, integrity, and availability, combined with the complexity of exploitation due to required privileges. No public exploits or active exploitation have been reported to date. The vulnerability affects a broad range of Fireware OS versions widely used in enterprise and government network security appliances, making it a critical concern for organizations relying on WatchGuard for perimeter defense and VPN services.

The vulnerability poses a significant risk to organizations globally that deploy WatchGuard Fireware OS in their network security infrastructure. Exploitation can lead to arbitrary code execution with high privileges, allowing attackers to compromise firewall devices, manipulate or intercept network traffic, disable security controls, or pivot to internal networks. This can result in data breaches, disruption of network services, and loss of trust in security infrastructure. Given the critical role of Fireware OS in protecting enterprise and government networks, successful exploitation could have cascading effects on confidentiality, integrity, and availability of sensitive data and systems. The requirement for privileged authentication limits exposure to insider threats or attackers who have already gained elevated access, but the network-based attack vector means that compromised credentials or lateral movement could enable exploitation. The absence of known exploits reduces immediate risk but does not diminish the urgency for remediation due to the potential severity of impact.

Organizations should prioritize applying official patches from WatchGuard as soon as they become available to address this buffer overflow vulnerability. Until patches are released, restrict access to the CLI interface to only trusted administrators and enforce strong authentication mechanisms, including multi-factor authentication, to reduce the risk of credential compromise. Implement strict network segmentation and monitoring to detect anomalous CLI command usage or privilege escalation attempts. Regularly audit privileged accounts and their activities to identify potential misuse. Employ intrusion detection and prevention systems capable of recognizing suspicious patterns related to certificate request commands. Additionally, consider deploying compensating controls such as limiting administrative access to management networks and using jump servers with enhanced logging and session recording. Maintain up-to-date backups and incident response plans to quickly recover from potential compromises.