CVE-2026-76703 in EdgeConnect SD-WAN Gateways
Summary
by MITRE • 09/15/2026
A buffer overflow vulnerability exists in the web-based management interface of HPE Networking EdgeConnect SD-WAN Gateways that could allow an authenticated attacker with administrative access to cause a denial of service. Successful exploitation could allow an attacker to disrupt system operations, potentially resulting in an unstable system state.
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Analysis
by VulDB Data Team • 09/15/2026
The identified vulnerability resides within the web-based management interface of HPE Networking EdgeConnect SD-WAN Gateways and is classified as a buffer overflow condition. This specific flaw allows for memory corruption when processing certain inputs that exceed the allocated buffer limits, leading to potential instability in the system's operational state. The nature of this vulnerability aligns with CWE-120, which describes Buffer Copy without Checking Size of Input Classic, indicating that the application fails to properly validate the length of user-supplied data before copying it into a fixed-size memory buffer. This lack of bounds checking is a critical security flaw in software development practices and represents a fundamental weakness in input validation mechanisms within the gateway's administrative interface.
Exploitation of this vulnerability requires an authenticated attacker possessing administrative access privileges to the device. While the requirement for authentication significantly raises the barrier to entry compared to unauthenticated remote code execution or denial-of-service attacks, it does not eliminate the risk entirely. An insider threat actor or a compromised administrator account can leverage this flaw to trigger the buffer overflow condition. Upon successful exploitation, the immediate operational impact is a denial of service against the gateway's management plane and potentially the data plane if the memory corruption affects critical system processes. The result is an unstable system state where normal operations are disrupted, leading to potential downtime for network connectivity managed by the SD-WAN infrastructure.
From a threat modeling perspective, this vulnerability facilitates actions consistent with ATT&CK technique T1529, System Shutdown or Reboot, as well as aspects of T1499, Endpoint Denial of Service. The attacker's ability to cause an unstable system state directly impacts the availability component of the CIA triad, which is a primary objective in many insider threat scenarios or targeted attacks against network infrastructure management layers. Although the attack vector requires high privileges, the impact on service continuity can be severe for organizations relying on continuous SD-WAN connectivity for branch office operations and data center interconnects.
Mitigation strategies should focus primarily on access control hardening and patch management. Organizations must ensure that administrative credentials are strictly controlled using multi-factor authentication to reduce the likelihood of credential compromise. Additionally, network segmentation policies should restrict direct internet-facing exposure of the management interface, ensuring it is only accessible from trusted internal networks or through a secure jump host with strict logging and monitoring enabled. Applying vendor-provided firmware updates that address this buffer overflow issue is essential for long-term remediation. Security teams should also implement behavioral analytics to detect anomalous activity patterns associated with administrative account misuse, providing an additional layer of defense against insider threats attempting to exploit such vulnerabilities.