CVE-2025-4663 in Brocade Fabric OS
Summary
by MITRE • 07/08/2025
An Improper Check for Unusual or Exceptional Conditions vulnerability in Brocade Fabric OS before 9.2.2.a could allow an authenticated, network-based attacker to cause a Denial-of-Service (DoS). The vulnerability is encountered when supportsave is invoked remotely, using ssh command or SANnav inline ssh, and the corresponding ssh session is terminated with Control C (^c ) before supportsave completion. This issue affects Brocade Fabric OS 9.0.0 through 9.2.2
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Analysis
by VulDB Data Team • 02/03/2026
The vulnerability identified as CVE-2025-4663 represents a critical improper check for unusual or exceptional conditions flaw within Brocade Fabric OS versions 9.0.0 through 9.2.2.a. This weakness falls under the CWE-707 category of improper check for unusual conditions, where the software fails to properly handle exceptional circumstances that occur during normal operation. The vulnerability specifically manifests when the supportsave command is executed remotely through SSH connections, creating a scenario where the system does not adequately manage the termination of these sessions during active data collection processes. The flaw exploits the lack of proper exception handling when users interrupt SSH sessions using Control C (^c) commands while supportsave operations are in progress, leading to potential system instability and service disruption.
The technical implementation of this vulnerability stems from insufficient error handling mechanisms within the Brocade Fabric OS SSH subsystem when processing supportsave commands. When an authenticated user initiates a supportsave operation through SSH either via direct command execution or SANnav inline SSH functionality, the system begins collecting diagnostic information from the fabric switch. However, if the user terminates the SSH session abruptly using Control C before the supportsave process completes, the system fails to properly clean up resources or handle the exceptional termination condition. This improper handling results in the system entering an inconsistent state where it cannot properly process subsequent commands or maintain normal operational functionality, effectively creating a denial-of-service condition that impacts the availability of the fabric switch services.
The operational impact of CVE-2025-4663 extends beyond simple service disruption to potentially compromise the overall reliability and availability of Brocade fabric switches in enterprise network environments. Network administrators who rely on remote diagnostic capabilities for troubleshooting and maintenance operations may find their ability to perform essential tasks severely impaired. The vulnerability affects organizations using Brocade Fabric OS versions 9.0.0 through 9.2.2.a, creating a significant risk for data center and storage area network administrators who depend on these switches for mission-critical operations. When exploited, the vulnerability can cause complete service unavailability requiring manual intervention to restore normal operations, potentially leading to extended downtime and operational disruption. The attack vector requires only authenticated access and network connectivity, making it particularly concerning as it can be exploited by both internal and external threat actors with appropriate credentials.
Mitigation strategies for CVE-2025-4663 should prioritize immediate patching of affected Brocade Fabric OS versions to 9.2.2.a or later releases where the vulnerability has been addressed. Organizations should implement strict access controls and monitor SSH session activities for unusual termination patterns that may indicate attempted exploitation. Network segmentation and privileged access management controls can help limit the potential impact of this vulnerability by restricting who can initiate supportsave operations. Security monitoring solutions should be configured to detect and alert on abnormal SSH session terminations during diagnostic command execution, providing early warning of potential exploitation attempts. Additionally, administrators should establish procedures for proper session management and ensure that supportsave operations are completed before terminating any SSH connections. The vulnerability aligns with ATT&CK technique T1499.004 for network denial of service, emphasizing the importance of proper exception handling in network infrastructure software. Organizations should also conduct regular vulnerability assessments and penetration testing to identify similar improper check conditions that may exist in their Brocade fabric switch configurations and other network infrastructure components.