Attack Chain

1. The attacker identifies a vulnerable UTT HiPER 1250GW device with a firmware version up to 3.2.7-210907-180535.
2. The attacker crafts a malicious HTTP request targeting the /route/goform/NTP endpoint.
3. The crafted request includes a specially designed Profile argument containing a payload that exceeds the buffer size allocated for it.
4. The web server on the UTT HiPER 1250GW device receives the HTTP request and passes the Profile argument to the strcpy function.
5. The strcpy function copies the oversized Profile argument into the undersized buffer, leading to a buffer overflow.
6. The buffer overflow overwrites adjacent memory regions, potentially including critical program data or executable code.
7. The attacker gains arbitrary code execution on the device with the privileges of the web server process.
8. The attacker can then use this foothold to further compromise the device or the network it is connected to, potentially leading to data exfiltration or denial-of-service attacks.

Impact

Successful exploitation of CVE-2026-7418 can allow a remote attacker to execute arbitrary code on the affected UTT HiPER 1250GW device. This could allow the attacker to gain full control of the device, potentially leading to data exfiltration, denial-of-service attacks, or further compromise of the network to which the device is connected. The vulnerability has a CVSS v3.1 score of 8.8, indicating a high severity. Given the public availability of the exploit, organizations using the affected devices are at increased risk.

Recommendation

• Apply available patches or firmware updates provided by UTT to address CVE-2026-7418 on HiPER 1250GW devices.
• Deploy the Sigma rule Detect Suspicious NTP Profile Argument to detect exploitation attempts against the /route/goform/NTP endpoint.
• Monitor web server logs for suspicious requests targeting the /route/goform/NTP endpoint with unusually long Profile arguments to identify potential exploitation attempts.