{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"state":"PUBLISHED","cveId":"CVE-2021-30116","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","assignerShortName":"mitre","dateUpdated":"2025-10-21T23:25:41.692Z","dateReserved":"2021-04-02T00:00:00.000Z","datePublished":"2021-07-09T00:00:00.000Z"},"containers":{"cna":{"title":"Unauthenticated credential leak and business logic flaw in Kaseya VSA <= v9.5.6","providerMetadata":{"orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","shortName":"mitre","dateUpdated":"2023-10-23T13:12:39.540Z"},"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":[{"url":"https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/"},{"url":"https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021"},{"url":"https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/"},{"url":"https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/"}],"credits":[{"lang":"en","value":"Discovered by Wietse Boonstra of DIVD"},{"lang":"en","value":"Additional research by Frank Breedijk of DIVD"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL"}}],"problemTypes":[{"descriptions":[{"type":"text","lang":"en","description":"n/a"}]}],"x_generator":{"engine":"Vulnogram 0.0.9"},"source":{"advisory":"DIVD-2021-00011","discovery":"INTERNAL"},"solutions":[{"lang":"en","value":"Upgrade to a version after 9.5.6"}]},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-03T22:24:59.326Z"},"title":"CVE Program Container","references":[{"url":"https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/","tags":["x_transferred"]},{"url":"https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021","tags":["x_transferred"]},{"url":"https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/","tags":["x_transferred"]},{"url":"https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/","tags":["x_transferred"]}]},{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-30116","role":"CISA Coordinator","options":[{"Exploitation":"active"},{"Automatable":"yes"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2025-02-04T19:41:32.875937Z"}}},{"other":{"type":"kev","content":{"dateAdded":"2021-11-03","reference":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30116"}}}],"references":[{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30116","tags":["government-resource"]}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","cweId":"CWE-522","description":"CWE-522 Insufficiently Protected Credentials"}]}],"timeline":[{"time":"2021-11-03T00:00:00.000Z","lang":"en","value":"CVE-2021-30116 added to CISA KEV"}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2025-10-21T23:25:41.692Z"}}]}}