Buffer Overflow Vulnerability in D-Link DIR-853 A1 Router

CVE-2025-25742

What is CVE-2025-25742?

CVE-2025-25742 is a notable buffer overflow vulnerability identified within the D-Link DIR-853 A1 router, a device commonly used for providing wireless network connectivity in homes and small offices. This vulnerability resides in the router's SetSysEmailSettings module, specifically associated with the AccountPassword parameter. If exploited, it could hinder an organization's network security, as it may allow unauthorized access to the router's configuration, leading to potential data exfiltration or further exploitation of connected devices.

Technical Details

The vulnerability is categorized as a stack-based buffer overflow, a common programming error where data exceeds the allocated buffer size, leading to the potential overwriting of adjacent memory. This type of flaw can be exploited by a malicious actor to execute arbitrary code, escalate privileges or compromise the integrity of the device and network. The specific version affected is D-Link DIR-853 A1 with firmware version 1.20B07.

Potential Impact of CVE-2025-25742

1. Unauthorized Access: Exploitation of this vulnerability may grant attackers unauthorized access to sensitive router settings, enabling them to alter configurations that could compromise the security of the entire network.

2. Data Exposure: The vulnerability could lead to unauthorized access to network traffic or sensitive information, endangering the confidentiality and integrity of data being transmitted over the network.

3. Network Compromise: With access to the router, attackers could pivot to other devices on the network, potentially introducing malware or launching further attacks on connected systems, leading to widespread disruption.

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