CVE-2021-40127 : Vulnerability Insights and Analysis
Learn about CVE-2021-40127, a Cisco Small Business Switches vulnerability allowing DoS attacks. Find out the impact, affected systems, and mitigation steps.
This CVE article provides detailed information about a vulnerability in Cisco Small Business Smart and Managed Switches that could lead to a denial of service (DoS) attack.
Understanding CVE-2021-40127
This section will cover the vulnerability details, impact, and technical aspects of CVE-2021-40127.
What is CVE-2021-40127?
A vulnerability in the web-based management interface of Cisco Small Business 200, 300, and 500 Series Switches could allow an attacker to render the interface unusable, resulting in a DoS condition due to improper HTTP request validation.
The Impact of CVE-2021-40127
The vulnerability has a CVSS base score of 5.3 (Medium) and could result in a permanent invalid redirect for requests to the affected devices, causing a DoS condition. No known public exploits or malicious uses have been reported.
Technical Details of CVE-2021-40127
This section focuses on the specific technical details of the CVE.
Vulnerability Description
The vulnerability stems from improper validation of HTTP requests in the web-based management interface, allowing unauthenticated remote attackers to exploit it.
Affected Systems and Versions
- Product: Cisco Small Business Smart and Managed Switches
- Vendor: Cisco
- Affected Version: Not applicable (n/a)
Exploitation Mechanism
To exploit this vulnerability, an attacker can send a crafted HTTP request to an affected device, triggering a permanent invalid redirect and leading to a DoS condition.
Mitigation and Prevention
Below are steps to mitigate the CVE-2021-40127 vulnerability.
Immediate Steps to Take
- Apply vendor-supplied patches as soon as they are available.
- Implement network security best practices to limit exposure to external threats.
Long-Term Security Practices
- Regularly monitor and update network devices for known vulnerabilities.
- Conduct security training for staff to raise awareness of potential threats.
Patching and Updates
- Regularly check for security advisories from Cisco and apply patches promptly to address vulnerabilities.