CVE-2026-1139
Remote Buffer Overflow in UTT 进取 520W strcpy Function
Publication date: 2026-01-19
Last updated on: 2026-02-04
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| unknown_vendor | utt_进取_520w | 1.7.7-180627 |
| utt | 520w_firmware | to 1.7.7-180627 (exc) |
Helpful Resources
Exploitability
| 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2026-1139 is a critical buffer overflow vulnerability in the UTT 进取 520W device, version 1.7.7-180627. It occurs in the strcpy function within the /goform/ConfigExceptMSN file, where user input is copied into a buffer without checking the input size. This unchecked copy leads to a buffer overflow, which can be triggered remotely by an attacker. The vulnerability arises from improper memory handling (CWE-120 and CWE-119) and allows exploitation without authentication. [2, 3]
How can this vulnerability impact me? :
Exploitation of this vulnerability can allow an attacker to perform a denial-of-service (DoS) attack against the affected router, compromising its availability. Additionally, the attacker may compromise the confidentiality, integrity, and availability of the system. The vulnerability is remotely exploitable and considered easy to exploit, with a public proof-of-concept available. There are no known mitigations, and the vendor did not respond to the disclosure. [2, 3]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by monitoring HTTP requests to the /goform/ConfigExceptMSN endpoint on the UTT 进取 520W router, specifically looking for unusually long or malformed input parameters that could trigger the strcpy buffer overflow. Since a proof-of-concept exploit is publicly available, network intrusion detection systems (NIDS) can be configured to detect exploit attempts targeting this endpoint. However, no specific detection commands are provided in the resources. [2, 3]
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include discontinuing use of the affected UTT 进取 520W device version 1.7.7-180627, as no known mitigations or patches are available. It is recommended to replace the affected product with an alternative device. Additionally, restricting network access to the vulnerable endpoint and monitoring for exploit attempts can help reduce risk until replacement. [3]