CVE-2026-76674 in EdgeConnect SD-WAN Gateways
Summary
by MITRE • 09/15/2026
Buffer overflow vulnerabilities exist in the underlying operating system of HPE Networking EdgeConnect SD-WAN Gateways that could allow an unauthenticated remote attacker to execute arbitrary code. Successful exploitation could allow an attacker to execute arbitrary commands on the underlying operating system leading to complete system compromise.
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Analysis
by VulDB Data Team • 09/15/2026
The vulnerability described constitutes a critical buffer overflow condition within the core operating system components of HPE Networking EdgeConnect SD-WAN Gateways. This specific flaw arises from improper boundary checking when processing input data, allowing an unauthenticated remote attacker to write beyond the allocated memory buffers. In network infrastructure devices such as Software-Defined Wide Area Network gateways, which serve as critical choke points for enterprise traffic, the presence of a buffer overflow is particularly severe because it bypasses standard authentication mechanisms entirely. The attacker does not need valid credentials or prior access to exploit this weakness, making it accessible to any entity capable of reaching the affected service over the network. This characteristic aligns with Common Weakness Enumeration identifier CWE-120, which classifies buffer copies without checking size limits as a fundamental memory safety violation that frequently leads to arbitrary code execution in production environments.
The technical mechanism behind this exploitation involves manipulating specific packet structures or protocol fields sent to the vulnerable service running on the gateway. By crafting maliciously formatted data payloads that exceed expected length constraints, an attacker can overwrite adjacent memory locations containing control flow information such as return addresses or function pointers. When the compromised routine attempts to resume execution after handling the input, it redirects program flow to shellcode injected by the attacker within the overflowed buffer. This process effectively grants the adversary a foothold on the underlying operating system kernel or user-space processes with elevated privileges inherent to the gateway service account. Such exploitation techniques are well-documented in cybersecurity frameworks and map directly to MITRE ATT&CK technique T1203, which covers Exploitation for Client Execution, as well as T1059 Command and Scripting Interpreter if subsequent command execution is performed via the compromised shell environment.
The operational impact of a successful exploitation event extends far beyond simple data exposure or denial of service. Since the vulnerability allows arbitrary code execution on the underlying operating system, an attacker gains full control over the SD-WAN gateway device. This level of compromise enables the adversary to intercept, modify, or drop network traffic traversing the WAN edge, effectively neutralizing security controls such as firewalls and intrusion prevention systems deployed at that location. Furthermore, the compromised gateway can serve as a pivot point for lateral movement into internal corporate networks, allowing attackers to access sensitive data stores, financial records, or intellectual property residing behind the perimeter defenses. The ability to execute arbitrary commands also permits the installation of persistent backdoors, rootkits, or cryptomining malware, leading to long-term unauthorized presence and potential ransomware deployment across the organization's infrastructure.
Mitigation strategies must prioritize immediate patching as the primary defense vector against this vulnerability. Organizations utilizing HPE Networking EdgeConnect SD-WAN Gateways should apply vendor-released firmware updates that address the underlying memory management flaws in the operating system components responsible for handling network inputs. Until patches are applied, strict access control lists restricting inbound traffic to only necessary ports and protocols can reduce the attack surface available to remote attackers. Additionally, deploying advanced threat protection solutions capable of deep packet inspection may help identify and block exploit attempts based on known malicious payload signatures associated with buffer overflow attacks. Continuous monitoring for anomalous network behavior or unexpected process executions on gateway devices is also recommended to detect potential exploitation activities in real time, ensuring rapid incident response capabilities are available if the vulnerability is targeted by active threat actors.