CVE-2021-27706 Explained : Impact and Mitigation
Learn about CVE-2021-27706, a critical buffer overflow vulnerability in Tenda G1 and G3 routers with firmware V15.11.0.17(9502)_CN, allowing remote code execution. Find mitigation steps and best practices here.
A buffer overflow vulnerability has been identified in Tenda G1 and G3 routers with firmware version V15.11.0.17(9502)_CN, potentially allowing remote attackers to execute arbitrary code by exploiting a specific request.
Understanding CVE-2021-27706
This CVE-2021-27706 vulnerability in Tenda routers poses a significant risk to network security due to a buffer overflow issue.
What is CVE-2021-27706?
The CVE-2021-27706 vulnerability resides in the way the 'formIPMacBindDel' function handles user input 'IPMacBindIndex,' allowing attackers to trigger a buffer overflow by exceeding the expected input length.
The Impact of CVE-2021-27706
If successfully exploited, remote attackers can exploit this vulnerability to execute malicious code on affected Tenda G1 and G3 routers, compromising the device and potentially the entire network's security.
Technical Details of CVE-2021-27706
This section outlines the specific technical details related to CVE-2021-27706 to provide a deeper understanding of the vulnerability.
Vulnerability Description
The vulnerability arises from the lack of proper input validation, enabling attackers to overwrite memory beyond the buffer's boundary, leading to arbitrary code execution.
Affected Systems and Versions
Tenda G1 and G3 routers running firmware version V15.11.0.17(9502)_CN are affected by this vulnerability, leaving them open to potential exploitation.
Exploitation Mechanism
Attackers can exploit the CVE-2021-27706 vulnerability by sending a specifically crafted request containing a malicious payload designed to trigger the buffer overflow in the 'formIPMacBindDel' function.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-27706 and enhance overall network security, immediate actions and long-term security practices are crucial.
Immediate Steps to Take
Users are advised to update their Tenda router firmware to the latest version provided by the vendor to patch the vulnerability and prevent potential exploitation.
Long-Term Security Practices
Implementing network segmentation, strong firewall rules, and regular security assessments can help strengthen the overall security posture and mitigate future vulnerabilities.
Patching and Updates
Regularly check for security updates and patches released by Tenda for their G1 and G3 routers to address known vulnerabilities and enhance device security.