CVE-2025-14733 in Fireware OS
Summary
by MITRE • 12/19/2025
An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow a remote unauthenticated attacker to execute arbitrary code. This vulnerability affects both the Mobile User VPN with IKEv2 and the Branch Office VPN using IKEv2 when configured with a dynamic gateway peer.This vulnerability affects Fireware OS 11.10.2 up to and including 11.12.4_Update1, 12.0 up to and including 12.11.5 and 2025.1 up to and including 2025.1.3.
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Analysis
by VulDB Data Team • 03/19/2026
The CVE-2025-14733 vulnerability represents a critical out-of-bounds write flaw within WatchGuard Fireware OS that exposes remote unauthenticated attackers to arbitrary code execution capabilities. This vulnerability specifically targets the IKEv2 implementation within the VPN functionality, creating a significant attack surface that could compromise network security infrastructure. The flaw exists in the handling of dynamic gateway peer configurations, where the system fails to properly validate input parameters during IKEv2 negotiation processes. Such vulnerabilities are particularly dangerous because they can be exploited without authentication, allowing attackers to gain unauthorized access to network resources from external positions. The affected versions span across multiple release branches including Fireware OS 11.10.2 through 11.12.4_Update1, 12.0 through 12.11.5, and the 2025.1 release series up to 2025.1.3, indicating a widespread impact across the product line.
The technical nature of this vulnerability stems from improper bounds checking within the IKEv2 protocol implementation when processing dynamic gateway peer configurations. When a remote attacker sends specially crafted IKEv2 packets to a vulnerable system, the system's memory management routines fail to validate the size or content of incoming data structures. This allows the attacker to write data beyond the allocated memory boundaries, potentially overwriting critical system memory regions including function pointers, return addresses, or other control structures. The out-of-bounds write condition creates an opportunity for attackers to manipulate program execution flow, leading to arbitrary code execution. This type of vulnerability maps directly to CWE-787 Out-of-bounds Write, which is classified as a high-severity weakness in the Common Weakness Enumeration catalog and is commonly exploited in remote code execution scenarios. The vulnerability's exploitation requires no authentication credentials, making it particularly attractive to threat actors seeking to compromise network infrastructure without detection.
The operational impact of CVE-2025-14733 extends beyond simple code execution, as it fundamentally undermines the security posture of organizations relying on WatchGuard firewalls for network protection. Attackers exploiting this vulnerability could gain complete control over affected devices, potentially enabling them to establish persistent access, redirect network traffic, or use compromised systems as launch points for further attacks. The Mobile User VPN with IKEv2 and Branch Office VPN configurations are particularly vulnerable because these components are often exposed to external networks and require dynamic peer configurations that increase the attack surface. Organizations using these VPN configurations face significant risk of unauthorized access to internal networks, especially when the affected firewalls are deployed in perimeter security roles. The vulnerability's presence in multiple release versions means that organizations across different generations of WatchGuard Fireware OS require immediate remediation efforts, creating operational complexity for security teams managing diverse network infrastructures.
Mitigation strategies for CVE-2025-14733 should prioritize immediate patch deployment from WatchGuard, as the vendor has likely released security updates addressing this specific vulnerability. Organizations should also implement network segmentation and access controls to limit exposure of vulnerable VPN endpoints to external networks. Monitoring for suspicious IKEv2 traffic patterns and anomalous VPN connection attempts can help detect potential exploitation attempts. Security teams should consider temporarily disabling vulnerable VPN configurations until patches are deployed, particularly in environments where the risk of exploitation is high. The vulnerability's classification as a remote code execution flaw aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter, where attackers might leverage the compromised system to execute malicious commands. Organizations should also review their incident response procedures to ensure readiness for potential exploitation attempts, as this vulnerability could enable attackers to establish persistent access that would require comprehensive system reinstallation for complete remediation. Network administrators should implement continuous monitoring of firewall logs for signs of exploitation attempts, particularly focusing on unusual IKEv2 negotiation patterns and connection behaviors that might indicate exploitation activity.