CVE-2026-73464 in EOS
Summary
by MITRE • 09/16/2026
On affected platforms running Arista EOS with gRPC Network Management Interface (gNMI) enabled, a specially crafted request could allow a malicious authenticated client with gRPC Network Management Interface (gNMI) access to execute arbitrary code with root privileges on the switch.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 09/16/2026
The vulnerability described represents a critical remote code execution flaw within the Arista EOS operating system, specifically targeting devices where the gRPC Network Management Interface is active and accessible. This security defect allows an authenticated attacker who possesses valid credentials for the gNMI service to bypass standard privilege escalation controls and achieve root-level access on the affected network switch. The core of this issue lies in how the gNMI subsystem processes incoming requests, suggesting a failure in input validation or memory management that permits arbitrary code injection when specific malformed data is transmitted through the interface.
From a technical perspective, such vulnerabilities typically stem from improper handling of untrusted input within high-level application layers that interact with lower-level system components. In this context, the gRPC framework serves as the transport mechanism for network telemetry and configuration updates. If the parsing logic for these requests does not strictly enforce bounds checking or type safety before passing data to underlying C++ libraries or kernel interfaces, it creates an opportunity for buffer overflows or heap corruption attacks. These memory corruption errors can be exploited to overwrite return addresses or function pointers in memory, thereby redirecting program execution flow to attacker-controlled shellcode. This mechanism effectively neutralizes the operating system's security boundaries, allowing the malicious code to execute with the highest level of privilege available on the device.
The operational impact of this vulnerability is severe due to its potential for complete network compromise. Since gNMI is often used for automated monitoring and configuration management in modern data centers, it may be exposed to internal networks or even external interfaces depending on organizational security policies. An attacker gaining root access can manipulate routing tables, intercept traffic via packet capture tools installed at the kernel level, disable logging mechanisms to cover their tracks, and pivot laterally into other parts of the infrastructure. This effectively turns a network switch from a passive forwarding device into an active command-and-control node within the enterprise environment, facilitating widespread data exfiltration or disruption services.
In terms of industry classification standards, this vulnerability aligns with CWE-78 Improper Neutralization of Special Elements used in an OS Command (OS Command Injection) if it involves direct system calls, or more likely CWE-120 Buffer Overflow without bounds check and CWE-94 Improper Control of Generation of Code. From a tactical standpoint within the MITRE ATT&CK framework, this exploit maps to T1059 Command and Scripting Interpreter for initial code execution and potentially T1068 Exploitation for Privilege Escalation if additional steps are required after gaining user-level access. The ability to execute arbitrary code as root places it firmly in the highest severity category of risk assessments, requiring immediate remediation attention.
Mitigation strategies must focus on both technical controls and architectural changes. The most effective solution is to apply vendor-provided software patches that address the specific memory handling flaws within the gNMI implementation. Organizations should also implement strict access control lists (ACLs) to restrict gRPC traffic to only authorized management stations, ensuring that this interface is not exposed to untrusted networks or general user subnets. Additionally, enabling mutual TLS authentication for gNMI connections adds a layer of identity verification beyond simple password-based login, reducing the risk posed by compromised credentials. Regular auditing of network services and disabling unused interfaces further reduces the attack surface available to potential adversaries seeking to leverage this vulnerability.