CVE-2026-19313 in Fireware OS
Summary
by MITRE • 08/28/2026
An heap overflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.
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Analysis
by VulDB Data Team • 08/28/2026
The identified vulnerability represents a critical security flaw within the Internet Key Exchange daemon, commonly referred to as ike or ike2, which is responsible for managing IPsec tunnel negotiations in WatchGuard Fireware operating systems. This specific weakness manifests as a heap overflow condition, occurring when the process fails to adequately validate the length of input data received during the establishment of secure connections. By transmitting specially crafted network packets that exceed expected buffer boundaries, an unauthenticated remote attacker can corrupt adjacent memory structures on the heap. This corruption allows for arbitrary code execution with the privileges of the compromised service account, effectively granting full control over the underlying operating system and potentially enabling lateral movement within the protected network infrastructure.
From a technical perspective, this vulnerability aligns closely with CWE-122, which denotes a heap-based buffer overflow where data is written beyond the allocated memory space on the heap rather than the stack. The root cause lies in insufficient boundary checks during the parsing of IKE protocol messages, specifically those involving payload length fields or cryptographic parameter sizes. When an attacker crafts packets that trigger these unchecked write operations, they can overwrite function pointers, object headers, or other critical control data structures stored in adjacent memory regions. This manipulation facilitates a return-oriented programming attack or direct shellcode injection, depending on the specific version of Fireware and available security mitigations such as ASLR and DEP. The absence of authentication requirements for this vector significantly lowers the barrier to entry for exploitation, allowing any host with network connectivity to attempt an attack without prior credential theft.
The operational impact of successfully exploiting this vulnerability is severe, resulting in a complete compromise of the firewall appliance. An attacker gaining code execution on the ike process can bypass all security policies enforced by the device, including access control lists and intrusion prevention rules. This effectively neutralizes the perimeter defense mechanism, exposing internal assets to direct attack. Furthermore, the compromised system can be used as a pivot point for further reconnaissance or attacks against other network segments that are only accessible through the firewall. The persistence of this vulnerability poses an ongoing risk until patched, as automated scanning tools and exploit frameworks increasingly target known heap overflow conditions in widely deployed enterprise security appliances.
Mitigation strategies must prioritize immediate patching to address the underlying memory safety issues within the ike daemon. Administrators should apply the latest firmware updates provided by WatchGuard that specifically resolve this CVE identifier. In environments where immediate patching is not feasible due to operational constraints, network segmentation and strict firewall rules restricting IKE traffic sources can provide a temporary compensating control. Additionally, enabling advanced logging features on the firewall may help in detecting anomalous connection attempts or malformed packets indicative of exploitation activity. Long-term resilience requires adopting secure coding practices that enforce rigorous input validation and memory management protocols during development to prevent similar heap-based vulnerabilities from being introduced into critical network infrastructure components. This incident underscores the importance of maintaining up-to-date security appliances, as unpatched legacy systems remain prime targets for automated remote code execution campaigns targeting known weaknesses in cryptographic services.