CVE-2026-5544: UTT HiPER 1250GW Buffer Overflow Flaw

CVE-2026-5544 Overview

CVE-2026-5544 is a stack-based buffer overflow vulnerability in the UTT HiPER 1250GW router through firmware version 3.2.7-210907-180535. The flaw resides in an unknown function within the /goform/formRemoteControl endpoint. Attackers can trigger the overflow by manipulating the Profile argument over the network. The vulnerability is classified under CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer. Public exploit details have been released, increasing the risk of opportunistic exploitation against exposed devices.

Critical Impact
Remote attackers with low privileges can corrupt stack memory on the router, potentially achieving arbitrary code execution and full compromise of the device.

Affected Products

UTT HiPER 1250GW router
Firmware versions up to and including 3.2.7-210907-180535
The vulnerable handler /goform/formRemoteControl

Discovery Timeline

2026-04-05 - CVE-2026-5544 published to the National Vulnerability Database
2026-04-24 - Last updated in NVD database

Technical Details for CVE-2026-5544

Vulnerability Analysis

The vulnerability exists in the HTTP request handler for /goform/formRemoteControl on the UTT HiPER 1250GW gateway. When the handler processes the Profile parameter, it copies attacker-supplied data into a fixed-size stack buffer without validating the input length. Supplying an oversized Profile value overruns the buffer and corrupts adjacent stack memory, including saved return addresses.

An attacker reaching the management interface can send a crafted POST request to trigger the overflow. Successful exploitation can hijack control flow and lead to arbitrary code execution under the privilege level of the web service. This typically grants administrative control over routing, DNS, and firewall configuration on the device.

Root Cause

The root cause is missing bounds checking on the Profile parameter before it is written into a stack-allocated buffer. The handler trusts the length of the incoming HTTP parameter, a pattern common in embedded router firmware that relies on legacy C string functions such as strcpy or sprintf.

Attack Vector

Exploitation requires network access to the device's web administration interface and low-privileged authentication. The attacker submits a crafted HTTP request to /goform/formRemoteControl with an overlong Profile value. Because the EPSS score is 0.053% (percentile 16.612), broad opportunistic exploitation is not yet observed, but public proof-of-concept material lowers the barrier to weaponization.

No verified exploit code is reproduced here. Refer to the GitHub CVE issue report and VulDB entry #355297 for technical detail on the request structure used to trigger the overflow.

Detection Methods for CVE-2026-5544

Indicators of Compromise

HTTP POST requests to /goform/formRemoteControl containing unusually long Profile parameter values
Unexpected reboots, watchdog resets, or httpd process crashes on the HiPER 1250GW
New or modified administrative accounts, port forwarding rules, or DNS settings on the device
Outbound connections from the router to unknown infrastructure following management-interface activity

Detection Strategies

Inspect web access logs on the router and any upstream reverse proxy for requests to /goform/formRemoteControl with parameter values exceeding expected length thresholds.
Deploy network intrusion detection signatures that flag oversized Profile fields in HTTP traffic destined for UTT management interfaces.
Correlate router crash events with preceding HTTP traffic to identify exploitation attempts.

Monitoring Recommendations

Forward router syslog and HTTP access logs to a centralized analytics platform for retention and pattern analysis.
Alert on any administrative interface access from non-management network segments or external IP ranges.
Baseline normal request sizes to /goform/* endpoints and alert on statistical outliers.

How to Mitigate CVE-2026-5544

Immediate Actions Required

Restrict access to the router's web administration interface to trusted management VLANs and remove any WAN-side exposure.
Rotate administrative credentials, since the attack requires low-privileged authentication that may be brute-forced or reused.
Audit device configuration for unauthorized changes to routing, DNS, port forwarding, and remote access settings.
Monitor vendor channels for a firmware update addressing CVE-2026-5544.

Patch Information

At the time of publication, no vendor advisory or patched firmware release has been linked in the NVD record for CVE-2026-5544. Administrators should consult the VulDB vulnerability record and UTT support channels for updated firmware availability.

Workarounds

Disable the remote management feature on the WAN interface if it is not required for operations.
Place the device behind a network firewall that restricts inbound HTTP/HTTPS access to the management interface.
Replace end-of-support or unpatched HiPER 1250GW units with supported hardware where a vendor patch is not forthcoming.

bash

# Configuration example: restrict management interface access at an upstream firewall
# Allow only the management subnet to reach the router admin UI
iptables -A FORWARD -s 10.10.10.0/24 -d <router_ip> -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -d <router_ip> -p tcp --dport 80 -j DROP
iptables -A FORWARD -d <router_ip> -p tcp --dport 443 -j DROP