CVE-2026-24103

Comprehensive Technical Analysis of CVE-2026-24103

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2026-24103 Description: A buffer overflow vulnerability was discovered in the goform/formSetMacFilterCfg function within the Tenda AC15V1.0 V15.03.05.18_multi firmware. CVSS Score: 9.8

Severity Evaluation: The CVSS score of 9.8 indicates a critical vulnerability. This high score is likely due to the potential for remote code execution, the ease of exploitation, and the significant impact on the confidentiality, integrity, and availability of the affected system.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: An attacker could exploit this vulnerability over the network, potentially without requiring authentication.
• Local Exploitation: If an attacker has local access to the device, they could exploit the vulnerability to escalate privileges or execute arbitrary code.

Exploitation Methods:

• Buffer Overflow: The attacker can send a specially crafted request to the goform/formSetMacFilterCfg endpoint, causing a buffer overflow. This can lead to arbitrary code execution or a denial of service (DoS).
• Memory Corruption: By overwriting adjacent memory, the attacker can manipulate the control flow of the program, leading to code execution or system crashes.

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/formSetMacFilterCfg function within the mentioned firmware version.

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Update: Apply the latest firmware update provided by Tenda to mitigate the vulnerability.
• Network Segmentation: Isolate the affected devices from critical networks to limit the potential impact of an exploit.
• Access Control: Implement strict access controls to limit who can access and configure the device.

Long-Term Strategies:

• Regular Patching: Establish a regular patching and update schedule for all network devices.
• Intrusion Detection: Deploy intrusion detection systems (IDS) to monitor for suspicious activity.
• Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate potential risks.

5. Impact on Cybersecurity Landscape

Broader Implications:

• Supply Chain Security: This vulnerability highlights the importance of securing the entire supply chain, including third-party vendors and their products.
• IoT Security: As IoT devices become more prevalent, ensuring their security is crucial to prevent large-scale attacks.
• Public Awareness: Increased awareness and education about the risks associated with unpatched devices can help mitigate future threats.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function: goform/formSetMacFilterCfg
• Firmware Version: V15.03.05.18_multi
• Exploit: The vulnerability can be triggered by sending a maliciously crafted HTTP request to the affected endpoint.

Exploit Code:

• Proof of Concept (PoC): The PoC code is available on GitHub, as referenced in the CVE details. Security professionals can use this to understand the exploit mechanism and develop detection signatures.

References:

• GitHub Repository
• Tenda Official Advisory

Detection and Response:

• Signatures: Develop IDS/IPS signatures to detect and block malicious requests targeting the goform/formSetMacFilterCfg endpoint.
• Logs: Monitor logs for unusual activity related to the affected function and investigate any anomalies.

Conclusion: CVE-2026-24103 represents a critical vulnerability that requires immediate attention. By understanding the technical details and implementing the recommended mitigation strategies, organizations can protect their networks and devices from potential exploitation. Regular updates, network segmentation, and robust security practices are essential to maintaining a secure cyber environment.