CVE-2026-71958
Received Received - Intake

Buffer Overflow in D-Link DWR-M961 Firmware

Publication date: 2026-08-08

Last updated on: 2026-08-08

Assigner: VulnCheck

Description
D-Link DWR-M961 devices with hardware version C1 and software version 1.1.2_C1_202602110044 contain a buffer overflow vulnerability in the quicksetup.cgi interface. A remote attacker can write overly long strings to the test4, ssid2, and username fields and execute arbitrary commands by crafting a specific payload, or cause the device to crash.

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Meta Information

Published
2026-08-08
Last Modified
2026-08-08
Generated
2026-08-08
AI Q&A
2026-08-08
EPSS Evaluated
N/A
NVD
CVE-2026-71958
EUVD
EUVD-2026-54810

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
d-link dwr-m961 to 1.1.5_C1_202607071108 (exc)
d-link dwr-m961 1.1.5_c1_202607071108

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

Attack-Flow Graph

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Executive Summary

This is a buffer overflow vulnerability in D-Link DWR-M961 devices with hardware version C1 and software version 1.1.2_C1_202602110044. It exists in the quicksetup.cgi interface where a remote attacker can send overly long strings to the test4, ssid2, and username fields. This allows arbitrary command execution or crashing the device.

Detection Guidance

To detect this vulnerability, scan for D-Link DWR-M961 devices with hardware version C1 and software versions prior to 1.1.5_C1_202607071108. Check if the quicksetup.cgi interface is accessible and test the test4, ssid2, and username fields for buffer overflow conditions by sending long strings.

Impact Analysis

An attacker could exploit this to take control of your D-Link DWR-M961 device remotely without authentication. This could lead to unauthorized access, data theft, or disruption of network services. The device may also become unresponsive and require a reboot.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations using affected devices may face compliance violations, legal penalties, and reputational damage.

Mitigation Strategies

Immediately update the D-Link DWR-M961 device firmware to version 1.1.5_C1_202607071108 or later. If an update is not available, isolate the device from untrusted networks and restrict access to the quicksetup.cgi interface.

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