EUVD-2025-6765

Comprehensive Technical Analysis of EUVD-2025-6765

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-6765, also known as CVE-2025-29137, is a buffer overflow issue in the Tenda AC7 V1.0 router firmware version V15.03.06.44. This vulnerability is located in the form_fast_setting_wifi_set function and is triggered by the timeZone parameter. The buffer overflow can lead to Remote Code Execution (RCE), which is a critical security risk.

Severity Evaluation:

• CVSS Base Score: 9.8
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The high CVSS score of 9.8 indicates a critical vulnerability. The vector breakdown shows that the attack can be executed over the network (AV:N), requires low complexity (AC:L), does not need any privileges (PR:N) or user interaction (UI:N), and has a high impact on confidentiality, integrity, and availability (C:H/I:H/A:H).

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attack: An attacker can exploit this vulnerability remotely over the network without needing physical access to the device.
• Phishing and Social Engineering: Attackers could trick users into visiting malicious websites that exploit this vulnerability.

Exploitation Methods:

• Buffer Overflow: By sending a specially crafted timeZone parameter, an attacker can overflow the buffer in the form_fast_setting_wifi_set function.
• RCE: Once the buffer is overflowed, the attacker can inject and execute arbitrary code on the affected device.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda AC7 V1.0 routers

Affected Software Versions:

• Firmware version V15.03.06.44

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Update: Users should immediately update their Tenda AC7 routers to the latest firmware version that addresses this vulnerability.
• Network Segmentation: Isolate the affected devices from critical networks to limit potential damage.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the router's management interface.

Long-Term Strategies:

• Regular Patch Management: Establish a routine for regularly updating firmware and software.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activities and potential exploitation attempts.
• User Education: Educate users about the risks of phishing and social engineering attacks.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European cybersecurity, particularly for home users and small businesses that rely on Tenda AC7 routers. The potential for RCE can lead to data breaches, unauthorized access, and disruption of services. Given the widespread use of such devices, the impact could be extensive if not addressed promptly.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function Affected: form_fast_setting_wifi_set
• Parameter: timeZone
• Type: Buffer Overflow leading to RCE

Exploitation Steps:

1. Identify Target: Locate the Tenda AC7 router on the network.
2. Craft Payload: Create a payload that overflows the buffer via the timeZone parameter.
3. Deliver Payload: Send the crafted payload to the router's management interface.
4. Execute Code: Once the buffer is overflowed, execute the injected code to gain control over the device.

Detection and Monitoring:

• Log Analysis: Monitor router logs for unusual activities or error messages related to the form_fast_setting_wifi_set function.
• Network Traffic Analysis: Use network monitoring tools to detect anomalous traffic patterns that may indicate an exploitation attempt.

References:

• NVD Entry
• GitHub Repository

By addressing this vulnerability promptly and implementing robust security measures, organizations and individuals can mitigate the risks associated with EUVD-2025-6765 and enhance their overall cybersecurity posture.