Out-of-Bounds Write Vulnerability in D-Link DIR-895L Router

CVE-2026-100740

What is CVE-2026-100740?

CVE-2026-100740 is a serious vulnerability found in the D-Link DIR-895L router, specifically impacting the L2TP Control Channel Parser within its code. This out-of-bounds write vulnerability occurs in the tunnel_set_params function of the tunnel.c file. When exploited, this flaw can allow an attacker to manipulate data structures beyond their allocated bounds, potentially leading to unexpected behavior or system crashes. Given that this exploit can be executed remotely, it poses a significant threat to organizations using this router model, as unauthorized access could allow attackers to take control of the device, manipulate its settings, or extract sensitive information from the network.

Potential impact of CVE-2026-100740

1. Remote Code Execution: The primary concern with CVE-2026-100740 is the potential for attackers to exploit the out-of-bounds write condition to execute arbitrary code on the router. This can allow them to gain unauthorized access to the network and perform malicious activities.

2. Network Compromise: As D-Link DIR-895L routers are widely used in both home and enterprise environments, a successful exploit could lead to the compromise of an entire network. Attackers could hinder operations, intercept sensitive data, or launch further attacks against connected devices.

3. Increased Ransomware Risk: Given the nature of this vulnerability and its publicly available exploit, there is a heightened risk that ransomware groups may target affected devices to encrypt data or hold systems hostage, demanding payment for restoration. The ability for such groups to exploit this vulnerability underscores the importance of patching and securing network devices promptly.

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