CVE-2026-77552 in UniFi Enterprise Audio
Summary
by MITRE • 08/26/2026
A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi Enterprise Audio/Video Bridge to execute a Command Injection on the device.
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Analysis
by VulDB Data Team • 08/26/2026
The discovery of a command injection vulnerability within the UniFi Enterprise Audio Video Bridge represents a critical security risk for organizations relying on this infrastructure for communication services. This flaw stems from improper input validation, specifically where user-supplied data is not adequately sanitized before being processed by underlying system commands or scripts. In typical operational scenarios, such vulnerabilities arise when developers fail to distinguish between executable code and trusted data inputs, allowing an attacker to manipulate the intended command structure. For a network-accessible device like the UniFi Enterprise Audio Video Bridge, this means that any entity capable of reaching the management interface or API endpoints can potentially inject malicious shell commands into the application logic. The severity is amplified by the privileged nature often associated with these devices, which may have access to sensitive internal networks and user data streams.
From a technical perspective, command injection occurs when an application passes unsafe user-supplied data to a system interpreter without proper escaping or validation. In this specific instance, the vulnerability allows for arbitrary code execution on the host operating system running the UniFi Enterprise Audio Video Bridge software. An attacker could exploit this by crafting specially formatted requests that contain shell metacharacters such as semicolons, pipes, or ampersands to chain additional commands after the legitimate ones intended by the application. This bypasses standard input constraints and grants the attacker a foothold within the device's environment. The impact of successful exploitation is severe, potentially leading to complete compromise of the bridge device, unauthorized access to connected audio video endpoints, and lateral movement into deeper network segments if the compromised device serves as a pivot point for further attacks.
The operational impact extends beyond mere data exfiltration or service disruption. Since UniFi Enterprise Audio Video Bridges are often central nodes in enterprise communication architectures, their compromise can lead to significant business continuity issues. Attackers could intercept sensitive communications, modify call routing configurations, or use the device as a botnet node for distributed denial of service attacks against other targets. Furthermore, because these devices frequently operate with elevated privileges to manage hardware interfaces and network settings, the attacker gains high-level access that is difficult to detect using standard monitoring tools unless specific behavioral analytics are in place. This aligns closely with CWE-78 Improper Neutralization of Special Elements used in an OS Command which highlights the fundamental failure in input handling mechanisms.
To mitigate this risk, immediate action must be taken by administrators and security teams. The primary remediation step is to apply the latest firmware updates provided by Ubiquiti Inc., as these typically include patches that enforce stricter input validation and sanitize user inputs before they reach system-level commands. Until patches are applied or if patching is not immediately feasible, network segmentation strategies should be employed to restrict access to the UniFi Enterprise Audio Video Bridge management interfaces only from trusted administrative subnets. Additionally, implementing strict firewall rules to limit inbound traffic on relevant ports can reduce the attack surface available to potential adversaries. Security teams should also monitor for anomalous outbound connections or unusual process executions originating from these devices, which may indicate active exploitation attempts consistent with ATT&CK technique T1059 Command and Scripting Interpreter usage in lateral movement scenarios.