Executive Summary

This vulnerability is a security flaw found in the UTT HiPER 1250GW device up to version 3.2.7-210907-180535. It exists in the strcpy function within the file route/goform/ConfigAdvideo. The flaw occurs when the argument 'Profile' is manipulated, causing a buffer overflow. This means that an attacker can send specially crafted input to overflow the buffer, potentially leading to unexpected behavior or control over the device.

The attack can be executed remotely, meaning an attacker does not need physical access to the device to exploit this vulnerability. Additionally, the exploit code has been publicly released, increasing the risk of attacks.

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Impact Analysis

Exploiting this vulnerability can lead to a buffer overflow, which may allow an attacker to execute arbitrary code on the affected device. This can result in unauthorized access, disruption of service, or complete compromise of the device.

Since the attack can be performed remotely and the exploit is publicly available, the risk of exploitation is significant. This could lead to loss of data confidentiality, integrity, and availability.

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Executive Summary

CVE-2026-7420 is a buffer overflow vulnerability found in the UTT HiPER 1250GW router firmware up to version 3.2.7-210907-180535. The flaw occurs in the /goform/ConfigAdvideo endpoint, specifically in the strcpy function when handling the Profile parameter. Because the input is not properly checked for length, an attacker can send an overly long value that causes memory to be overwritten beyond its intended boundary.

This vulnerability can be exploited remotely by sending a specially crafted POST request, which can lead to denial of service or potentially other malicious effects due to memory corruption.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable /goform/ConfigAdvideo endpoint by implementing network-level controls such as firewall rules or access control lists to limit who can send requests to the device.

Additionally, monitor network traffic for suspicious POST requests targeting this endpoint with unusually long parameters.

If possible, update the device firmware to a version that patches this vulnerability once available from the vendor.

Until a patch is applied, consider isolating the device from untrusted networks to reduce exposure.

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Impact Analysis

This vulnerability can impact you by allowing a remote attacker to cause a denial of service on the affected UTT HiPER 1250GW device. By exploiting the buffer overflow, the attacker can crash the device or disrupt its normal operation.

Additionally, because buffer overflows can sometimes be leveraged to execute arbitrary code, there is a potential risk of further compromise, although the primary documented impact is denial of service.

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Detection Guidance

This vulnerability can be detected by sending a specially crafted POST request to the /goform/ConfigAdvideo endpoint of the UTT HiPER 1250GW router. The request should include an overly long parameter (such as "timestart" or "Profile") to test for buffer overflow conditions.

A proof-of-concept involves using a command-line tool like curl to send this malicious POST request and observe if the device crashes or behaves unexpectedly, indicating the presence of the vulnerability.

• Example curl command to test the vulnerability: curl -X POST http://<target-ip>/goform/ConfigAdvideo -d "Profile=$(python3 -c 'print("A"*1000)')"
• Monitor the device for crashes, reboots, or denial of service symptoms after sending the request.

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