Critical Buffer Overflow Vulnerability Exposes D-Link DWR-M920 Routers (CVE-2025-13553)

Overview

CVE-2025-13553 is a high-severity buffer overflow vulnerability affecting D-Link DWR-M920 routers running firmware version 1.1.50. This vulnerability allows remote attackers to potentially execute arbitrary code on the affected device. A public exploit is already available, increasing the risk of widespread exploitation.

Technical Details

The vulnerability resides in the sub_41C7FC function within the /boafrm/formPinManageSetup file. The attack is triggered by manipulating the submit-url argument, leading to a buffer overflow. Because the vulnerability is remotely exploitable, devices exposed to the internet are particularly at risk.

Successful exploitation can allow a malicious actor to gain complete control of the device, potentially leading to data theft, malware installation, or use of the router as part of a botnet.

CVSS Analysis

The Common Vulnerability Scoring System (CVSS) assigns this vulnerability a score of 8.8, classifying it as HIGH severity. This score reflects the ease of exploitation and the potential impact of a successful attack.

• CVSS Score: 8.8
• Severity: HIGH

Possible Impact

The exploitation of CVE-2025-13553 could have severe consequences:

• Remote Code Execution: Attackers can execute arbitrary code on the router.
• Data Theft: Sensitive information transmitted through the router could be compromised.
• Malware Installation: The router could be infected with malware.
• Botnet Recruitment: Compromised routers could be added to a botnet for malicious purposes.
• Denial of Service: The router’s functionality could be disrupted, leading to a denial-of-service condition.

Mitigation and Patch Steps

The most effective mitigation strategy is to apply the official patch or firmware update provided by D-Link. Please check the D-Link support website for the latest updates:

• Apply Firmware Update: Check the D-Link support page (https://www.dlink.com/) for a firmware update that addresses this vulnerability.
• Disable Remote Management: If possible, disable remote management access to the router to reduce the attack surface.
• Use Strong Passwords: Ensure you are using a strong, unique password for the router’s administrative interface.
• Monitor Network Traffic: Monitor your network for suspicious activity that may indicate a compromised device.

Until a patch is applied, consider isolating the D-Link DWR-M920 from the public internet by placing it behind a firewall or another router with more robust security features.