CVE-2026-14721: UTT HiPER 1250GW Stack Buffer Overflow in Wireless Config

Technical summary

The vulnerability is a stack-based buffer overflow (CWE-121) in the /goform/ConfigWirelessBase_5g web endpoint of the UTT HiPER 1250GW gateway. The ssid parameter lacks proper input validation or bounds checking, allowing an attacker to write beyond allocated stack memory. This can overwrite critical stack data including return addresses, enabling arbitrary code execution in the context of the web server process. The flaw requires valid authentication credentials to exploit, limiting attack surface to authenticated users or those who have compromised credentials.

Business impact

Compromise of a UTT HiPER 1250GW device allows an attacker to execute arbitrary commands on the gateway, potentially compromising network integrity, intercepting traffic, modifying routing configurations, or using the device as a pivot point into internal networks. For organizations relying on these gateways for network edge connectivity, this represents a critical integrity and confidentiality risk. The availability of public exploit code means this vulnerability is likely to be actively exploited if affected devices remain unpatched.

Affected systems

UTT HiPER 1250GW wireless gateways running firmware versions up to and including 3.2.7-210907-180535 are affected. Organizations should inventory all instances of this device model and verify the installed firmware version. Devices operating in remote or branch office deployments may be particularly difficult to patch rapidly.

Exploitability

Exploitation requires valid login credentials to the device's web interface (CVSS score reflects authentication requirement via PR:L). However, the CVSS 8.8 HIGH severity indicates that once an authenticated session is established—whether through credential compromise, default credentials, or insider threat—the buffer overflow can be reliably triggered to achieve full system compromise. The disclosure of public exploit code significantly increases practical exploitability.

Remediation

Identify all UTT HiPER 1250GW devices in your environment and document their current firmware versions. Contact UTT or consult their security advisories for the availability of patched firmware addressing this vulnerability. Apply updates in a controlled manner, prioritizing devices exposed to untrusted networks or with sensitive data access. As an interim control, restrict administrative access to the web interface to trusted IP ranges and enforce strong authentication credentials.

Patch guidance

Verify the availability of a patched firmware release from UTT that addresses CVE-2026-14721. Firmware updates for gateway devices should be applied during maintenance windows with rollback plans in place. Test patches in a non-production environment first, particularly given the critical nature of gateway devices. Document pre-patch and post-patch firmware versions to ensure successful deployment. If a patch is unavailable, maintain compensating controls such as network segmentation and access restrictions.

Detection guidance

Monitor web server logs for unusually long or malformed SSID parameters submitted to /goform/ConfigWirelessBase_5g. Detection systems should flag HTTP requests containing binary payloads or excessively long parameter values to this endpoint. Network-based intrusion detection signatures should be deployed if available from your IDS vendor. Monitor device logs for unexpected crashes or restarts of the web service, which may indicate exploit attempts. Correlate failed and successful authentication events with suspicious parameter submissions.

Why prioritize this

This vulnerability merits immediate attention due to the combination of HIGH CVSS severity (8.8), availability of public exploit code, and the critical role of gateway devices in network infrastructure. While authentication is required, the potential for credential compromise or insider threat makes this an active threat. The affected device model's use in remote deployments compounds the risk of delayed patching.

Risk score, explained

The CVSS 3.1 score of 8.8 reflects a HIGH severity vulnerability with network-accessible attack vector, low attack complexity, and full impact on confidentiality, integrity, and availability once an authenticated session is established. The authentication requirement (PR:L) prevents unauthenticated remote exploitation but does not substantially reduce risk given the critical function of the affected device and likelihood of credential exposure in complex environments.

Frequently asked questions