{"history":[{"alert":0,"cve":"CVE-2021-30116","id":22235,"kind":"epss","observed_at":1794500401,"payload":"{\"date\": \"2026-11-12\", \"epss\": 0.85735, \"percentile\": 0.9973}"},{"alert":0,"cve":"CVE-2021-30116","id":19854,"kind":"epss","observed_at":1794327601,"payload":"{\"date\": \"2026-11-10\", \"epss\": 0.85735, \"percentile\": 0.99728}"},{"alert":0,"cve":"CVE-2021-30116","id":17820,"kind":"epss","observed_at":1794241201,"payload":"{\"date\": \"2026-11-09\", \"epss\": 0.85735, \"percentile\": 0.99728}"},{"alert":0,"cve":"CVE-2021-30116","id":15884,"kind":"epss","observed_at":1794154800,"payload":"{\"date\": \"2026-11-08\", \"epss\": 0.85735, \"percentile\": 0.99729}"},{"alert":0,"cve":"CVE-2021-30116","id":13862,"kind":"epss","observed_at":1794068402,"payload":"{\"date\": \"2026-11-07\", \"epss\": 0.85735, \"percentile\": 0.99728}"},{"alert":0,"cve":"CVE-2021-30116","id":11644,"kind":"epss","observed_at":1793982001,"payload":"{\"date\": \"2026-11-06\", \"epss\": 0.85735, \"percentile\": 0.99728}"},{"alert":0,"cve":"CVE-2021-30116","id":9630,"kind":"epss","observed_at":1793938800,"payload":"{\"date\": \"2026-11-05\", \"epss\": 0.85735, \"percentile\": 0.99728}"},{"alert":1,"cve":"CVE-2021-30116","id":8486,"kind":"cna","observed_at":1793895600,"payload":"{\"containers\": {\"adp\": [{\"providerMetadata\": {\"dateUpdated\": \"2024-08-03T22:24:59.326Z\", \"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\"}, \"references\": [{\"tags\": [\"x_transferred\"], \"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/\"}], \"title\": \"CVE Program Container\"}, {\"metrics\": [{\"other\": {\"content\": {\"id\": \"CVE-2021-30116\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"total\"}], \"role\": \"CISA Coordinator\", \"timestamp\": \"2021-07-06T00:00:00+00:00\", \"version\": \"2.0.3\"}, \"type\": \"ssvc\"}}, {\"other\": {\"content\": {\"dateAdded\": \"2021-11-03\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30116\"}, \"type\": \"kev\"}}], \"problemTypes\": [{\"descriptions\": [{\"cweId\": \"CWE-522\", \"description\": \"CWE-522 Insufficiently Protected Credentials\", \"lang\": \"en\", \"type\": \"CWE\"}]}], \"providerMetadata\": {\"dateUpdated\": \"2026-08-14T03:55:30.740Z\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\"}, \"references\": [{\"tags\": [\"government-resource\"], \"url\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30116\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2021-11-03T00:00:00.000Z\", \"value\": \"CVE-2021-30116 added to CISA KEV\"}], \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"affected\": [{\"product\": \"n/a\", \"vendor\": \"n/a\", \"versions\": [{\"status\": \"affected\", \"version\": \"n/a\"}]}], \"credits\": [{\"lang\": \"en\", \"value\": \"Discovered by Wietse Boonstra of DIVD\"}, {\"lang\": \"en\", \"value\": \"Additional research by Frank Breedijk of DIVD\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021. 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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.\"}], \"metrics\": [{\"cvssV3_1\": {\"attackComplexity\": \"LOW\", \"attackVector\": \"NETWORK\", \"availabilityImpact\": \"HIGH\", \"baseScore\": 10, \"baseSeverity\": \"CRITICAL\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"scope\": \"CHANGED\", \"userInteraction\": \"NONE\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H\", \"version\": \"3.1\"}}], \"problemTypes\": [{\"descriptions\": [{\"description\": \"n/a\", \"lang\": \"en\", \"type\": \"text\"}]}], \"providerMetadata\": {\"dateUpdated\": \"2023-10-23T13:12:39.540Z\", \"orgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"shortName\": \"mitre\"}, \"references\": [{\"url\": \"https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/\"}, {\"url\": 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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."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"description":"n/a","lang":"en","type":"text"}]}],"providerMetadata":{"dateUpdated":"2023-10-23T13:12:39.540Z","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","shortName":"mitre"},"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/"}],"solutions":[{"lang":"en","value":"Upgrade to a version after 9.5.6"}],"source":{"advisory":"DIVD-2021-00011","discovery":"INTERNAL"},"title":"Unauthenticated credential leak and business logic flaw in Kaseya VSA <= v9.5.6","x_generator":{"engine":"Vulnogram 0.0.9"}}},"cveMetadata":{"assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","assignerShortName":"mitre","cveId":"CVE-2021-30116","datePublished":"2021-07-09T00:00:00.000Z","dateReserved":"2021-04-02T00:00:00.000Z","dateUpdated":"2026-08-14T03:55:30.740Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"cna_checked":1794370801,"cve":"CVE-2021-30116","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.","epss":{"date":"2026-11-12","epss":0.85735,"percentile":0.9973},"epss_checked":1794522003,"first_seen":1793665375,"kev":{"cveID":"CVE-2021-30116","cwes":["CWE-522"],"dateAdded":"2021-11-03","dueDate":"2021-11-17","forensicTriage":"No","knownRansomwareCampaignUse":"Known","notes":"https://nvd.nist.gov/vuln/detail/CVE-2021-30116","product":"Virtual System/Server Administrator (VSA)","requiredAction":"Apply updates per vendor instructions.","shortDescription":"Kaseya Virtual System/Server Administrator (VSA) contains an information disclosure vulnerability allowing an attacker to obtain the sessionId that can be used to execute further attacks against the system.","vendorProject":"Kaseya","vulnerabilityName":"Kaseya Virtual System/Server Administrator (VSA) Information Disclosure Vulnerability"},"kev_checked":1794522003,"products":"n/a n/a","references":["https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/","https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021","https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/","https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30116"],"score":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","provider":"mitre","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"solutions":"Upgrade to a version after 9.5.6","state":"PUBLISHED","title":"Unauthenticated credential leak and business logic flaw in Kaseya VSA <= v9.5.6","updated_at":1794500401,"workarounds":""},"sources":[]}