CVE-2026-95862 in Dream Machines
Summary
by MITRE • 09/22/2026
A malicious actor with access to the network could exploit an Out-of-bounds Write vulnerability found in certain UniFi gateway devices to execute a Denial of Service (DoS) attack on the device.
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Analysis
by VulDB Data Team • 09/22/2026
The identified security flaw represents a critical memory management error within the firmware of specific Ubiquiti UniFi gateway appliances, classified technically as an Out-of-bounds Write vulnerability. This type of defect occurs when software writes data to a memory location that falls outside the intended buffer boundaries, potentially overwriting adjacent memory structures such as heap metadata or control flow pointers. In the context of network infrastructure devices like gateways and routers, which often run complex embedded Linux systems with various background services handling packet processing and routing tables, improper bounds checking during input validation can lead to severe instability. The vulnerability allows a malicious actor who has established access to the local network segment to craft specific malformed packets or exploit protocol implementations that trigger this memory corruption event.
From an operational perspective, the primary impact of exploiting this Out-of-bounds Write is a Denial of Service condition rather than immediate remote code execution, although the latter remains a latent risk depending on the exact memory layout and exploitation technique used by an attacker. When the vulnerability is triggered, it causes the affected service or kernel subsystem to crash, resulting in the gateway device becoming unresponsive or rebooting unexpectedly. This disruption effectively severs network connectivity for all devices relying on that gateway for internet access and internal communication, causing significant downtime for residential users or small business operations. The attacker does not necessarily need high-level privileges; mere layer two or three network access is sufficient to deliver the malicious payload, making this a threat vector accessible to any user connected to the local area network without authentication barriers.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-787, which defines out-of-bounds write as accessing memory beyond allocated boundaries, and it also maps to MITRE ATT&CK techniques related to resource exhaustion or service disruption within a specific host environment. The lack of proper input sanitization in the network stack processing logic allows external inputs to corrupt internal state variables, leading to system instability. Security researchers emphasize that while DoS is the immediate consequence, memory corruption vulnerabilities are often precursors to more severe exploits if the overwritten data includes function pointers or return addresses, which could theoretically allow for arbitrary code execution under specific conditions.
Mitigation strategies must focus on both technical remediation and network segmentation practices. The most effective solution is to apply the firmware update provided by Ubiquiti that patches the underlying buffer handling logic in the affected gateway models. Administrators should verify their device versions against official security advisories and schedule maintenance windows for updates during low-traffic periods to minimize operational disruption. In environments where immediate patching is not feasible, network segmentation can help mitigate risk by restricting access to management interfaces and critical infrastructure components from untrusted or public-facing networks. Additionally, implementing strict ingress filtering on edge devices to drop malformed packets before they reach the vulnerable processing logic can reduce the attack surface. Continuous monitoring for unusual traffic patterns indicative of fuzzing attempts or repeated connection resets may also aid in early detection of exploitation activities targeting this weakness.