A buffer overflow vulnerability (CVE-2026-5566) was discovered in UTT HiPER 1250GW routers up to firmware version 3.2.7-210907-180535. The vulnerability affects the strcpy function in the /goform/formNatStaticMap file, where manipulation of the NatBind argument leads to buffer overflow. The vulnerability can be exploited remotely and a public exploit is now available. This makes it a high-risk security issue for affected UTT router deployments requiring immediate patching or mitigation.