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A critical stack-based buffer overflow vulnerability (CVE-2026-14721) in UTT HiPER 1250GW firmware versions up to 3.2.7-210907-180535 allows remote, unauthenticated attackers to achieve arbitrary code execution by manipulating the 'ssid' argument in the /goform/ConfigWirelessBase_5g web endpoint, with public exploit disclosure indicating active exploitation risk.