CVE-2026-71958: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in D-Link Corporation DWR-M961
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.
AI Analysis
Technical Summary
The D-Link DWR-M961 router, specifically hardware version C1 running software version 1.1.2_C1_202602110044, contains a buffer overflow vulnerability in the quicksetup.cgi interface. Remote attackers can exploit this by sending excessively long input strings to the test4, ssid2, and username fields. Successful exploitation can result in arbitrary command execution or cause the device to crash. The vulnerability is identified as CVE-2026-71958 with a CVSS 4.0 score of 9.3, indicating critical severity. No official remediation or patch information is currently available.
Potential Impact
A remote unauthenticated attacker can exploit this vulnerability to execute arbitrary commands on the affected device or cause it to crash, potentially leading to denial of service or full compromise of the device.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the quicksetup.cgi interface from untrusted networks to reduce exposure.
CVE-2026-71958: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in D-Link Corporation DWR-M961
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.
CVSS v4.0
Score 9.3critical
Affected software
D-Link Corporation
DWR-M961
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The D-Link DWR-M961 router, specifically hardware version C1 running software version 1.1.2_C1_202602110044, contains a buffer overflow vulnerability in the quicksetup.cgi interface. Remote attackers can exploit this by sending excessively long input strings to the test4, ssid2, and username fields. Successful exploitation can result in arbitrary command execution or cause the device to crash. The vulnerability is identified as CVE-2026-71958 with a CVSS 4.0 score of 9.3, indicating critical severity. No official remediation or patch information is currently available.
Potential Impact
A remote unauthenticated attacker can exploit this vulnerability to execute arbitrary commands on the affected device or cause it to crash, potentially leading to denial of service or full compromise of the device.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the quicksetup.cgi interface from untrusted networks to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-08T16:43:04.177Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a7766d6bf8831d539e949a9
Added to database: 08/08/2026, 17:26:46 UTC
Last enriched: 08/16/2026, 13:45:51 UTC
Last updated: 09/22/2026, 13:47:48 UTC
Views: 76
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