--- title: "CVE-2021-30116: Unauthenticated credential leak… | CubePath" 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…" language: en source: https://cubepath.com/security/cve/CVE-2021-30116 --- # CVE-2021-30116: Unauthenticated credential leak… | CubePath ## 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 accepts credentials via a GET request \* Access to KaseyaD.ini gives an attacker access to sufficient information to penetrate the Kaseya installation and its clients. Impact --- Via the page /dl.asp enough information can be obtained to give an attacker a sessionId that can be used to execute further (semi-authenticated) attacks against the system. Official description from the CVE record, published by mitre. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-30116) ## Key data ### CVSS 3.1 Critical 10.0 Score published by mitre in the CVE record. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H | Metric | Value | What it means | | ---------------------- | ------- | ----------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Scope | Changed | The impact can reach other components beyond the vulnerable one. | | Confidentiality impact | High | Serious or total effect on the secrecy of data. | | Integrity impact | High | Serious or total effect on the trustworthiness of data. | | Availability impact | High | Serious or total effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.85735 (85.7% probability) Percentile 99.7% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog Kaseya Virtual System/Server Administrator (VSA) Information Disclosure Vulnerability Added to the catalog Nov 3, 2021 Federal due date Nov 17, 2021 Ransomware campaigns Known use ### CISA assessment as of Jul 6, 2021 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable yes Technical impact total ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-522](https://cwe.mitre.org/data/definitions/522.html) Insufficiently Protected Credentials ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2](https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/) - [helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Importa…](https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021) - [csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure](https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/) - [secpod.com/blog/kaseya-vsa-zero-day-by-revil](https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/) ## Timeline 1. ID reserved Apr 2, 2021 2. Record published Jul 9, 2021 3. Added to CISA KEV Nov 3, 2021 4. Record last updated Aug 14, 2026 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:37 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)