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CVE-2026-71958 is a critical buffer overflow vulnerability in the quicksetup.cgi web interface of D-Link DWR-M961 routers, affecting hardware version C1 with firmware prior to 1.1.5_C1_202607071108, including 1.1.2_C1_202602110044. The flaw is triggered when the device processes overly long input supplied to the test4, ssid2, or username parameters. Insufficient bounds checking in this request handling path allows a remote attacker to corrupt memory and, with a crafted payload, achieve arbitrary command execution on the device. Failed or partial exploitation can also destabilize the router and cause it to crash.
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Critical memory buffer overflow vulnerability in the D-Link DWR-M961 that allows remote code execution or device crash.
A critical unauthenticated remote buffer overflow vulnerability in the D-Link DWR-M961 router's quicksetup.cgi interface via test4, ssid2, and username fields, enabling device compromise or crash.
A buffer overflow vulnerability in the quicksetup.cgi interface of D-Link DWR-M961 devices that can allow remote attackers to execute arbitrary commands or crash the device.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.