CVE-2025-11653
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-13

Last updated on: 2026-02-10

Assigner: VulDB

Description
A vulnerability was determined in UTT HiPER 2620G up to 3.1.4. Impacted is the function strcpy of the file /goform/fNTP. This manipulation of the argument NTPServerIP causes buffer overflow. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
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Meta Information
Published
2025-10-13
Last Modified
2026-02-10
Generated
2026-06-16
AI Q&A
2025-10-13
EPSS Evaluated
2026-06-15
NVD
CVE-2025-11653
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
utt 2620g_firmware to 3.1.4 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.
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Executive Summary

CVE-2025-11653 is a critical buffer overflow vulnerability in the UTT HiPER 2620G router firmware version 3.1.4 and earlier. It occurs in the strcpy function within the /goform/fNTP endpoint when handling the NTPServerIP parameter. The vulnerability arises because the input is copied without proper boundary checks, allowing an attacker to send a specially crafted HTTP POST request with an excessively long NTPServerIP value that causes a buffer overflow. This can lead to denial-of-service (DoS) or arbitrary code execution on the affected device. [1, 2, 3]

Impact Analysis

Exploitation of this vulnerability can impact the confidentiality, integrity, and availability of the affected device. An attacker can remotely trigger a buffer overflow that may cause the device to crash (denial-of-service) or allow the attacker to execute arbitrary code, potentially taking control of the router. This can disrupt network operations and compromise network security. [1, 2, 3]

Detection Guidance

This vulnerability can be detected by monitoring HTTP POST requests sent to the endpoint /goform/fNTP, specifically looking for unusually long or malformed NTPServerIP parameters that could trigger a buffer overflow. Detection can involve capturing and inspecting network traffic for such POST requests. For example, using tools like tcpdump or Wireshark to filter HTTP POST requests to /goform/fNTP and analyzing the NTPServerIP parameter length. A sample tcpdump command to capture relevant traffic could be: tcpdump -i <interface> -A 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' and then filtering for POST requests to /goform/fNTP. Additionally, using curl or similar tools to test the endpoint with crafted payloads can help verify if the system is vulnerable. [1, 3]

Mitigation Strategies

Immediate mitigation steps include disabling the SNTP feature if possible, to prevent the vulnerable strcpy operation from being triggered. Since no official vendor patch or response is available, it is recommended to replace the affected UTT HiPER 2620G device with a non-vulnerable alternative. Network-level protections such as blocking or filtering HTTP POST requests to /goform/fNTP can also reduce exposure. Monitoring for exploit attempts and isolating vulnerable devices from untrusted networks are advisable until a secure firmware update or device replacement is implemented. [2, 3]

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