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CVE-2026-71958 is a critical stack-based buffer overflow vulnerability in the web management interface of D-Link DWR-M961 routers, affecting hardware version C1 with firmware versions prior to 1.1.5_C1_202607071108, including 1.1.2_C1_202602110044. The flaw is present in the quicksetup.cgi interface, where insufficient bounds checking on the test4, ssid2, and username parameters allows an unauthenticated remote attacker to submit overly long input. By crafting a specific payload, an attacker can corrupt memory and achieve arbitrary command execution on the device; malformed input may also destabilize the process and crash the router.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.