CVE-2021-1161 Explained : Impact and Mitigation

Multiple vulnerabilities in the web-based management interface of Cisco Small Business RV Series Routers could allow an authenticated, remote attacker to execute arbitrary code or cause an affected device to restart unexpectedly due to improper user input validation. These vulnerabilities have a CVSS base score of 7.2.

Understanding CVE-2021-1161

This CVE describes vulnerabilities in Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers that could be exploited by sending crafted HTTP requests.

What is CVE-2021-1161?

The vulnerabilities in Cisco Small Business RV Series Routers could enable a remote attacker with administrator credentials to execute arbitrary code or trigger a denial of service attack by reloading the device.

The Impact of CVE-2021-1161

A successful exploit could allow the attacker to gain root access to the underlying operating system or disrupt device operation, causing a denial of service condition with high confidentiality, integrity, and availability impacts.

Technical Details of CVE-2021-1161

The vulnerability is associated with CWE-121 and has a CVSS v3.1 base score of 7.2 with low attack complexity and network accessibility. High impacts on availability, confidentiality, and integrity are observed.

Vulnerability Description

The improper validation of user-supplied input in the web-based management interface could lead to remote command execution and denial of service.

Affected Systems and Versions

All Cisco Small Business RV Series Routers are affected. The specific versions impacted are not disclosed.

Exploitation Mechanism

An attacker could exploit these vulnerabilities by sending crafted HTTP requests to an affected device, requiring valid administrator credentials to succeed.

Mitigation and Prevention

Organizations should take immediate steps to secure their systems and follow long-term security practices to mitigate the risks associated with CVE-2021-1161.

Immediate Steps to Take

Ensure all administrator credentials are secure and monitor network traffic for any signs of exploitation. Employ firewall rules and access controls to limit unauthorized access.

Long-Term Security Practices

Regularly update firmware and software to the latest versions to address known vulnerabilities. Implement security best practices and conduct security audits periodically.

Patching and Updates

Cisco has not released software updates addressing these vulnerabilities yet. Continue to monitor Cisco's security advisories for patches and mitigations.