CVE-2026-76691 in EdgeConnect SD-WAN Gateways
Summary
by MITRE • 09/15/2026
Buffer overflow vulnerabilities exist in the API endpoint of HPE Networking EdgeConnect SD-WAN Gateways. Successful exploitation could allow an authenticated remote attacker to execute arbitrary commands as a privileged user on the underlying operating system.
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Analysis
by VulDB Data Team • 09/15/2026
The identified vulnerability represents a critical security flaw within the application programming interface (API) endpoints of Hewlett Packard Enterprise Networking EdgeConnect Software-Defined Wide Area Network gateways. This specific weakness is classified fundamentally as a buffer overflow, which occurs when a program writes more data to a fixed-length block of memory than it can hold. In this context, the vulnerability resides in how the gateway processes input received through its API endpoints. The presence of such an error indicates insufficient bounds checking or improper handling of user-supplied data during the parsing and processing stages within the application logic. This technical deficiency allows for the corruption of adjacent memory structures, which is a precursor to more severe exploitation scenarios involving control flow hijacking.
The operational impact of this vulnerability is severe due to its potential for remote code execution with elevated privileges. An attacker who successfully exploits this buffer overflow condition can achieve arbitrary command execution on the underlying operating system hosting the EdgeConnect gateway. Crucially, this access is granted as a privileged user, meaning the compromise extends beyond simple data exfiltration or service disruption. It grants the adversary full control over the host environment, enabling them to install malware, create backdoors, pivot to other network segments protected by the SD-WAN infrastructure, and potentially disrupt critical business operations dependent on secure wide-area connectivity. The requirement for authentication does not mitigate this risk significantly in enterprise environments where internal threats or compromised credentials are common vectors for attack.
From a classification perspective, this vulnerability aligns with Common Weakness Enumeration identifier CWE-120, which covers buffer copy without checking size of input classic buffer overflow vulnerabilities. Furthermore, the exploitation path maps to MITRE ATT&CK techniques related to Initial Access and Privilege Escalation. Specifically, it relates to T1190 Exploit Public-Facing Application for initial compromise if authentication can be bypassed or brute-forced, followed by T1068 Exploitation for Privilege Escalation once the buffer overflow is triggered to gain higher-level system access. Understanding these mappings helps in aligning defensive strategies with established industry frameworks and threat intelligence models.
Mitigation efforts must prioritize immediate patching of the EdgeConnect software to versions that address this specific memory handling flaw. In addition to applying vendor-provided updates, organizations should implement strict network segmentation policies to limit exposure of API endpoints to only necessary management networks. Access control lists should be configured to restrict API access to trusted IP addresses and authenticated users with minimal required privileges. Continuous monitoring for anomalous traffic patterns indicative of buffer overflow attempts, such as unusually large payload sizes or malformed HTTP requests targeting the API, is also recommended to detect potential exploitation activities in real-time before successful compromise occurs.