D-Link DWR-M961 up to 1.1.5_C1_202607071107 Quicksetup quicksetup.cgi test4/ssid2/username buffer overflow

Summaryinfo

A vulnerability categorized as very critical has been discovered in D-Link DWR-M961 up to 1.1.5_C1_202607071107. The affected element is an unknown function of the file quicksetup.cgi of the component Quicksetup. Such manipulation of the argument test4/ssid2/username leads to buffer overflow. This vulnerability is documented as CVE-2026-71958. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in D-Link DWR-M961 up to 1.1.5_C1_202607071107. It has been rated as very critical. Affected by this issue is an unknown functionality of the file quicksetup.cgi of the component Quicksetup. The manipulation of the argument test4/ssid2/username with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to 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, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at supportannouncement.us.dlink.com. This vulnerability is handled as CVE-2026-71958 since 08/08/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 08/08/2026).

Upgrading to version 1.1.5_C1_202607071108 eliminates this vulnerability.

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Productinfo

Vendor

• D-Link

Name

• DWR-M961

Version

• 1.1.5_C1_202607071107

License

• commercial

Website

• Vendor: https://www.dlink.com/

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CPE 2.2info

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