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CVE-2021-30120

9.9 · CRITICAL

Kaseya VSA before 9.5.7 allows attackers to bypass the 2FA requirement.

Published Jul 9, 2021CWE-669EPSS 5.70%

Overview

CVE-2021-30120 is a critical-severity vulnerability. It was published on July 9, 2021 and has a CVSS 3.1 base score of 9.9 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.9, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Kaseya VSA before 9.5.7 allows attackers to bypass the 2FA requirement. The need to use 2FA for authentication in enforce client-side instead of server-side and can be bypassed using a local proxy. Thus rendering 2FA useless. Detailed description --- During the login process, after the user authenticates with username and password, the server sends a response to the client with the booleans MFARequired and MFAEnroled. If the attacker has obtained a password of a user and used an intercepting proxy (e.g. Burp Suite) to change the value of MFARequered from True to False, there is no prompt for the second factor, but the user is still logged in.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcsirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/Refcsrit.divd.nl/CVE-2021-30120Refcsrit.divd.nl/DIVD-2021-00011Refcsirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/Refcsrit.divd.nl/CVE-2021-30120Refcsrit.divd.nl/DIVD-2021-00011

How CyberStrike helps

Frequently asked questions

What is CVE-2021-30120?

CVE-2021-30120 is a critical-severity vulnerability. It was published on July 9, 2021 and has a CVSS 3.1 base score of 9.9 (CRITICAL).

How severe is CVE-2021-30120?

This vulnerability has a CVSS 3.1 base score of 9.9, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-30120?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-30120?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-30120 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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