CVE-2021-45995 : What You Need to Know

Tenda routers G1 and G3 v15.11.0.17(9502)_CN contain a stack overflow vulnerability in the function formSetStaticRoute, allowing attackers to trigger a Denial of Service (DoS) by manipulating certain parameters.

Understanding CVE-2021-45995

This CVE details a vulnerability in Tenda routers G1 and G3 that can lead to a DoS attack.

What is CVE-2021-45995?

The vulnerability lies in the formSetStaticRoute function of Tenda routers G1 and G3, presenting a DoS risk via specific parameter manipulation.

The Impact of CVE-2021-45995

Exploitation can result in a DoS scenario, potentially disrupting network services and causing downtime.

Technical Details of CVE-2021-45995

This section delves into the technical aspects of the CVE.

Vulnerability Description

A stack overflow in the formSetStaticRoute function of Tenda routers G1 and G3 exposes a DoS vector through specific parameter values.

Affected Systems and Versions

Product: Tenda routers G1 and G3
Version: v15.11.0.17(9502)_CN

Exploitation Mechanism

Attackers can exploit the vulnerability by manipulating parameters like staticRouteNet, staticRouteMask, and staticRouteGateway to trigger a DoS condition.

Mitigation and Prevention

Protecting systems against CVE-2021-45995 requires immediate action and long-term security practices.

Immediate Steps to Take

Update routers to the latest firmware version provided by Tenda.
Implement network segmentation to contain potential attacks.
Monitor network traffic for unusual patterns that may indicate exploitation attempts.

Long-Term Security Practices

Regularly update router firmware to patch vulnerabilities.
Conduct security assessments to identify and address any weaknesses.

Patching and Updates

Apply patches released by Tenda promptly to secure systems against this vulnerability.