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CVE-2021-30116

10.0 · CRITICALActively Exploited

Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021.

Published Jul 9, 2021CWE-522EPSS 85.73%

Overview

CVE-2021-30116 is a critical-severity vulnerability. It was published on July 9, 2021 and has a CVSS 3.1 base score of 10.0 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021. By default Kaseya VSA on premise offers a download page where the clients for the installation can be downloaded. The default URL for this page is https://x.x.x.x/dl.asp When an attacker download a client for Windows and installs it, the file KaseyaD.ini is generated (C:\Program Files (x86)\Kaseya\XXXXXXXXXX\KaseyaD.ini) which contains an Agent_Guid and AgentPassword This Agent_Guid and AgentPassword can be used to log in on dl.asp (https://x.x.x.x/dl.asp?un=840997037507813&pw=113cc622839a4077a84837485ced6b93e440bf66d44057713cb2f95e503a06d9) This request authenticates the client and returns a sessionId cookie that can be used in subsequent attacks to bypass authentication. Security issues discovered --- * Unauthenticated download page leaks credentials * Credentials of agent software can be used to obtain a sessionId (cookie) that can be used for services not intended for use by agents * dl.asp

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/2021/07/04/Kaseya-Case-Update-2/Refcsirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/Refhelpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021Refwww.secpod.com/blog/kaseya-vsa-zero-day-by-revil/Refcsirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/Refcsirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/Refhelpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021Refwww.secpod.com/blog/kaseya-vsa-zero-day-by-revil/CISAwww.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30116

How CyberStrike helps

Frequently asked questions

What is CVE-2021-30116?

CVE-2021-30116 is a critical-severity vulnerability. It was published on July 9, 2021 and has a CVSS 3.1 base score of 10.0 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2021-30116?

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-30116?

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-2021-30116?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-30116 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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