CVE-2026-93865 in Fireware OS
Summary
by MITRE • 10/27/2026
A missing authentication vulnerability in the Fireware OS FireCluster synchronization daemon allows a remote, unauthenticated attacker to invoke privileged system-level administrative actions by sending a specially crafted request to the FireCluster management IP when the clustering feature is enabled.
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Analysis
by VulDB Data Team • 10/27/2026
The identified vulnerability represents a critical failure in access control mechanisms within the Fireware Operating System's FireCluster synchronization daemon. This flaw specifically affects environments where high availability and load balancing features are active, as these configurations rely on continuous communication between cluster nodes to maintain state consistency. The core technical deficiency lies in the lack of authentication checks for incoming requests directed at the management interface used for cluster coordination. Consequently, any entity capable of reaching this specific IP address over the network can interact with the daemon without providing valid credentials or cryptographic proof of identity. This absence of verification allows an unauthenticated remote attacker to bypass security boundaries that are typically enforced by user login processes and role-based access controls inherent in standard administrative interfaces.
From a technical perspective, the vulnerability exploits the trust relationship established between cluster members for synchronization purposes. The daemon is designed to accept commands from other nodes or management stations to update firewall rules, session tables, and configuration states across the cluster. However, due to the missing authentication logic, this channel of communication does not validate the source's authority before executing privileged system-level administrative actions. An attacker can craft a specially formatted request that mimics legitimate cluster traffic but contains instructions for modifying critical security policies or disabling protective mechanisms. This exploitation vector is particularly dangerous because it operates at the infrastructure layer, potentially allowing the modification of firewall rules to permit unauthorized access, disable intrusion prevention systems, or alter logging configurations to cover subsequent malicious activities.
The operational impact of this vulnerability is severe and wide-ranging. By leveraging this flaw, an attacker can effectively take control of the network perimeter defense managed by the Fireware device. This could result in the complete compromise of confidentiality, integrity, and availability for all traffic passing through or protected by the firewall. Attackers may use this access to open backdoors, redirect traffic to malicious servers, or disrupt service availability by shutting down critical services on one or more cluster nodes. Furthermore, because FireCluster involves multiple devices, a successful exploitation could lead to inconsistent states across the cluster if commands are applied unevenly, potentially creating security gaps that are difficult to detect and remediate without full administrative access.
This vulnerability aligns with Common Weakness Enumeration (CWE) ID 306, which describes Missing Authentication for Critical Function. It also maps directly to MITRE ATT&CK technique T1078, Valid Accounts, although in this case, the attacker does not need valid accounts due to the authentication bypass; it falls under unauthorized access patterns that lead to privilege escalation and lateral movement within the network infrastructure. The ability to invoke administrative actions remotely without credentials places this flaw in a high-severity category, requiring immediate attention from security operations teams responsible for managing next-generation firewalls.
Mitigation strategies must focus on both technical remediation and architectural hardening. The primary solution is to apply the vendor-provided software patch that addresses the authentication gap within the FireCluster synchronization daemon. Until patches are applied or deployed in staging environments, network segmentation should be enforced to restrict access to the cluster management IP address exclusively from trusted internal subnets known to contain authorized administrative workstations and other legitimate cluster nodes. Access Control Lists (ACLs) on upstream routers or switches can help limit exposure by blocking traffic from external networks or untrusted segments. Additionally, enabling strict logging for all interactions with the synchronization daemon is recommended to facilitate rapid detection of any attempted exploitation activities through anomalous request patterns or unauthorized access attempts.