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CVE-2021-40121 Explained : Impact and Mitigation

Learn about CVE-2021-40121, a vulnerability in Cisco Identity Services Engine Software allowing cross-site scripting attacks. Discover the impact and mitigation steps.

Cisco Identity Services Engine (ISE) Software has multiple vulnerabilities in its web-based management interface that could lead to cross-site scripting attacks. This CVE was published on October 20, 2021, by Cisco.

Understanding CVE-2021-40121

This section will provide an in-depth understanding of the cross-site scripting vulnerabilities in Cisco Identity Services Engine Software.

What is CVE-2021-40121?

CVE-2021-40121 pertains to multiple vulnerabilities in the web-based management interface of Cisco Identity Services Engine (ISE) Software that may enable an attacker to execute a cross-site scripting (XSS) attack against a user of the interface.

The Impact of CVE-2021-40121

The impact of this CVE is rated with a CVSS base score of 6.1, categorizing it with a medium severity level. The details are as follows:

        Attack Vector: Network
        Attack Complexity: Low
        Privileges Required: None
        User Interaction: Required
        Scope: Changed
        Confidentiality Impact: Low
        Integrity Impact: Low
        Availability Impact: None

Technical Details of CVE-2021-40121

In this section, we will delve into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerabilities in the web-based management interface of Cisco Identity Services Engine (ISE) Software allow threat actors to perform a cross-site scripting (XSS) attack, compromising the security of the system.

Affected Systems and Versions

Affected system:

        Product: Cisco Identity Services Engine Software
        Vendor: Cisco
        Version: n/a

Exploitation Mechanism

At the time of publication, no public announcements or malicious exploitation regarding this vulnerability were reported by the Cisco Product Security Incident Response Team (PSIRT).

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-40121, certain measures need to be taken to secure the affected systems.

Immediate Steps to Take

        Regularly monitor Cisco's security advisories for updates and patches.
        Implement appropriate security controls to prevent XSS attacks.
        Educate users about the risks of clicking on unverified links or downloading suspicious files.

Long-Term Security Practices

        Conduct routine security assessments and penetration testing of the system.
        Keep software and systems updated with the latest security patches.

Patching and Updates

It is crucial to apply the patches provided by Cisco promptly to address the vulnerabilities and enhance the security of the systems.

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