D-Link DWR-M961 pre-1.1.5_C1 buffer overflow in QuickSetup.cgi
CVE-2026-71958 Published on August 8, 2026
D-Link DWR-M961 Buffer Overflow via quicksetup.cgi
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.
Vulnerability Analysis
CVE-2026-71958 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is a Classic Buffer Overflow Vulnerability?
The program 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, leading to a buffer overflow. A buffer overflow condition exists when a program attempts to put more data in a buffer than it can hold, or when a program attempts to put data in a memory area outside of the boundaries of a buffer. The simplest type of error, and the most common cause of buffer overflows, is the "classic" case in which the program copies the buffer without restricting how much is copied. Other variants exist, but the existence of a classic overflow strongly suggests that the programmer is not considering even the most basic of security protections.
CVE-2026-71958 has been classified to as a Classic Buffer Overflow vulnerability or weakness.
Products Associated with CVE-2026-71958
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Affected Versions
D-Link Corporation DWR-M961:- Before 1.1.5_C1_202607071108 is affected.