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CVE-2026-14721: UTT HiPER 1250GW Remote Code Execution via Buffer Overflow

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.

CVE-2026-14721 identifies a severe stack-based buffer overflow vulnerability affecting UTT HiPER 1250GW devices, specifically firmware versions up to 3.2.7-210907-180535. The flaw resides within an unspecified function of the /goform/ConfigWirelessBase_5g file, part of the device's Web Endpoint component. This vulnerability is triggered by manipulating the ssid argument supplied to this endpoint, allowing a remote attacker to overflow a buffer. The exploit for this vulnerability has been publicly disclosed and, as such, poses an immediate and significant risk of active exploitation. For defenders, this means internet-exposed UTT HiPER 1250GW devices are vulnerable to unauthenticated remote code execution, granting attackers full control and potentially compromising the underlying network infrastructure.

Attack Chain

  1. Initial Reconnaissance: An attacker identifies internet-facing UTT HiPER 1250GW devices and confirms their vulnerable firmware version (up to 3.2.7-210907-180535).
  2. Exploit Crafting: The attacker develops or utilizes a publicly available exploit that crafts a malicious HTTP POST request.
  3. Payload Delivery: The crafted HTTP POST request is sent to the /goform/ConfigWirelessBase_5g web endpoint on the target device.
  4. Argument Manipulation: The request specifically manipulates the ssid argument, supplying an oversized or specially malformed string containing attacker-controlled data, often embedding shellcode.
  5. Buffer Overflow Trigger: Upon processing the manipulated ssid argument, the vulnerable function in the ConfigWirelessBase_5g component encounters a stack-based buffer overflow.
  6. Arbitrary Code Execution: The overflow corrupts memory and diverts program execution to the attacker's injected shellcode, achieving arbitrary code execution with the privileges of the affected process.
  7. Device Compromise: The attacker gains full control over the UTT HiPER 1250GW device, enabling subsequent malicious activities such as network pivoting, data exfiltration, or establishing persistent access.

Impact

The successful exploitation of CVE-2026-14721 results in complete compromise of the UTT HiPER 1250GW device, granting the attacker arbitrary code execution capabilities. Given that these devices are typically network infrastructure components (gateways, routers), a compromise can lead to significant network disruption, unauthorized access to internal network segments, data interception, or the use of the device as a pivot point for further attacks. While specific victim counts or targeted sectors are not detailed, any organization utilizing affected UTT HiPER 1250GW devices exposed to the internet is at high risk, especially with the public disclosure of exploit code.

Recommendation

  • Patch CVE-2026-14721 immediately by upgrading UTT HiPER 1250GW devices to a patched firmware version beyond 3.2.7-210907-180535.
  • Monitor web server access logs for HTTP POST requests directed to the /goform/ConfigWirelessBase_5g path.
  • Implement Web Application Firewall (WAF) rules to scrutinize and block unusually long or malformed ssid parameters in requests targeting the /goform/ConfigWirelessBase_5g web endpoint, which could indicate exploitation attempts against CVE-2026-14721.