Overview
CVE-2025-14139 is a medium severity security vulnerability affecting UTT 进取 520W routers, specifically version 1.7.7-180627. This vulnerability is a buffer overflow in the strcpy function of the /goform/formConfigDnsFilterGlobal file. The issue arises from improper handling of the timeRangeName argument, potentially allowing attackers to execute arbitrary code.
Technical Details
The vulnerability lies within the strcpy function. By manipulating the timeRangeName argument when submitting data to /goform/formConfigDnsFilterGlobal, an attacker can supply an overly long string that exceeds the buffer’s capacity. This leads to a buffer overflow condition, potentially overwriting adjacent memory regions and ultimately gaining control of the device.
The exploit has been publicly disclosed, increasing the risk of exploitation by malicious actors. The vendor was notified but has not responded to the disclosure.
CVSS Analysis
The Common Vulnerability Scoring System (CVSS) score for CVE-2025-14139 is 5.7 (Medium).
This score reflects the potential for remote exploitation and the impact on system availability and integrity. While the exploit might require some level of network access, the ease of exploitation and potential for code execution makes it a significant concern.
Possible Impact
Successful exploitation of CVE-2025-14139 could have significant consequences, including:
- Remote Code Execution (RCE): Attackers could execute arbitrary code on the affected router, potentially gaining complete control of the device.
- Denial of Service (DoS): An attacker could crash the router, disrupting network connectivity for all connected devices.
- Data Theft: Sensitive data transmitted through the router could be intercepted and stolen.
- Network Pivoting: The compromised router could be used as a pivot point to attack other devices on the network.
Mitigation or Patch Steps
Unfortunately, as of the date of this article, no official patch or firmware update has been released by UTT to address CVE-2025-14139. Given the vendor’s lack of response, immediate mitigation is difficult. However, users can take the following precautionary steps:
- Firewall Rules: Implement strict firewall rules to limit access to the router’s management interface from external networks.
- Access Control: Change the default administrative password to a strong, unique password. Enable multi-factor authentication if available.
- Network Segmentation: Segment your network to isolate sensitive devices from the router.
- Monitor Network Traffic: Monitor network traffic for suspicious activity originating from or directed towards the router.
- Consider Replacement: If possible, consider replacing the vulnerable router with a more secure alternative from a vendor with a better security track record.
We will update this article if UTT releases a patch or provides further guidance.