CVE-2026-76682 in EdgeConnect SD-WAN Gateways
Summary
by MITRE • 09/15/2026
A vulnerability in the network security monitoring component of intrusion detection systems could allow an unauthenticated remote attacker to exploit a limited buffer overflow. Successful exploitation could allow an attacker to cause a denial-of-service or potentially execute arbitrary code on the system.
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Analysis
by VulDB Data Team • 09/15/2026
The identified vulnerability resides within the network security monitoring subsystem, specifically affecting the packet processing logic of intrusion detection systems designed for high-throughput environments. This component is responsible for inspecting incoming traffic against predefined signatures and behavioral models to identify malicious activity. The core technical flaw involves a limited buffer overflow condition triggered during the parsing or handling of specific network packets. When an unauthenticated remote attacker sends crafted data that exceeds the expected buffer capacity, it causes memory corruption within the application's execution space. This type of vulnerability is classically categorized under CWE-120 Buffer Copy without Checking Size of Input and often relates to improper input validation mechanisms where boundary checks are either missing or incorrectly implemented for certain packet types or header structures.
The operational impact of this flaw is significant due to its remote nature and the lack of required authentication, which lowers the barrier to entry for potential attackers. Successful exploitation can lead to two primary outcomes depending on the specific memory layout and exploitability conditions. The most immediate consequence is a denial-of-service condition where the intrusion detection system crashes or becomes unresponsive, effectively blinding the network security infrastructure to ongoing attacks. This creates a critical window of opportunity for other malicious activities that go undetected due to the compromised monitoring capability. In more severe scenarios involving precise memory manipulation and available exploit primitives, an attacker may achieve arbitrary code execution on the underlying host system. Given that intrusion detection systems often operate with elevated privileges or have access to sensitive network metadata, gaining control over this component can provide a strategic foothold for further lateral movement within the protected environment.
From a threat intelligence perspective, this vulnerability aligns with ATT&CK techniques related to Initial Access and Defense Evasion. Attackers may leverage such flaws to bypass security controls by causing service disruption or by establishing persistence through code execution on critical infrastructure components. The exploitation of buffer overflows in network-facing services is a well-documented attack vector that has historically been used in major worm campaigns, highlighting the persistent risk associated with memory safety issues in C and C++ based software commonly found in networking equipment.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. The primary corrective action involves applying vendor-provided patches or firmware updates that resolve the buffer overflow condition by implementing strict input validation and bounds checking for all incoming packet data. Organizations should also consider deploying virtual patching solutions, such as Web Application Firewalls or Intrusion Prevention System signatures, to block exploit attempts at the network perimeter before they reach the vulnerable component. Additionally, enforcing least privilege principles ensures that even if exploitation occurs, the potential impact is contained by limiting the permissions of the intrusion detection system process. Regular vulnerability scanning and penetration testing focused on network-facing services are essential for identifying similar weaknesses in other components of the security infrastructure.