EUVD-2026-9196

Comprehensive Technical Analysis of EUVD-2026-9196

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2026-9196 pertains to a command injection flaw in the goform/formSetIptv function of Tenda AC15V1.0 V15.03.05.18_multi. The issue arises because the input parameter s1_1 is not properly validated before being concatenated into doSystemCmd, which can lead to arbitrary command execution.

Severity Evaluation:

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

The CVSS score of 9.8 indicates a critical vulnerability due to the following factors:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

This high score underscores the potential for severe impact, including unauthorized access to sensitive information, data corruption, and system compromise.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: An attacker can exploit this vulnerability over the network without requiring local access or user interaction.
• Command Injection: By crafting a malicious input for s1_1, an attacker can inject arbitrary commands that will be executed by the system.

Exploitation Methods:

• Crafted Input: An attacker can send a specially crafted HTTP request to the vulnerable endpoint, embedding malicious commands within the s1_1 parameter.
• Automated Scripts: Attackers may use automated scripts to scan for vulnerable devices and exploit them en masse.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda AC15V1.0 devices running firmware version V15.03.05.18_multi.

Software Versions:

• Specifically, the vulnerability is present in the goform/formSetIptv function of the mentioned firmware version.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Patching: Apply the latest firmware update provided by Tenda to mitigate the vulnerability.
• Network Segmentation: Isolate affected devices from critical networks to limit potential damage.
• Input Validation: Implement strict input validation and sanitization for all user inputs.

Long-Term Mitigation:

• Regular Updates: Ensure that all devices are regularly updated with the latest security patches.
• Security Audits: Conduct regular security audits and vulnerability assessments.
• Intrusion Detection: Deploy intrusion detection systems (IDS) to monitor for suspicious activities.

5. Impact on European Cybersecurity Landscape

The presence of such a critical vulnerability in widely used devices like Tenda AC15V1.0 can have significant implications for European cybersecurity:

• Widespread Impact: Given the popularity of Tenda devices, the vulnerability could affect a large number of users and organizations.
• Critical Infrastructure: If such devices are used in critical infrastructure, the potential for disruption is high.
• Regulatory Compliance: Organizations must ensure compliance with regulations such as GDPR, which mandates robust security measures to protect personal data.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function: goform/formSetIptv
• Parameter: s1_1
• Execution Path: s1_1 is passed into sub_B0488 and concatenated into doSystemCmd without validation.

Exploitation Steps:

1. Identify Vulnerable Device: Scan the network for devices running the affected firmware version.
2. Craft Malicious Input: Create a payload that includes malicious commands within the s1_1 parameter.
3. Send Request: Send the crafted HTTP request to the vulnerable endpoint.
4. Command Execution: The device will execute the injected commands, leading to potential system compromise.

Detection and Monitoring:

• Log Analysis: Monitor system logs for unusual command executions.
• Network Traffic: Analyze network traffic for suspicious HTTP requests targeting the vulnerable endpoint.
• Behavioral Analysis: Use behavioral analysis tools to detect anomalous activities that may indicate an exploitation attempt.

Conclusion: The command injection vulnerability in Tenda AC15V1.0 V15.03.05.18_multi is critical and requires immediate attention. Organizations should prioritize patching affected devices and implementing robust security measures to mitigate the risk. Regular monitoring and auditing are essential to detect and respond to potential exploitation attempts effectively.