{"api_version":"1","generated_at":"2026-07-23T13:49:26+00:00","cve":"CVE-2021-30116","urls":{"html":"https://cve.report/CVE-2021-30116","api":"https://cve.report/api/cve/CVE-2021-30116.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-30116","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-30116"},"summary":{"title":"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.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2021-07-09 14:15:00","updated_at":"2023-10-23 14:15:00"},"problem_types":["CWE-522"],"metrics":[],"references":[{"url":"https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021","name":"https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021","refsource":"MISC","tags":[],"title":"Important Notice July 7th, 2021 – Kaseya","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/","name":"https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/","refsource":"MISC","tags":[],"title":"Kaseya VSA REvil Ransomware Attack 2021 - ransomware attacks 2021","mime":"text/html","httpstatus":"403","archivestatus":"200"},{"url":"https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/","name":"https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/","refsource":"MISC","tags":[],"title":"Kaseya VSA Limited Disclosure | DIVD CSIRT","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/","name":"https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/","refsource":"MISC","tags":[],"title":"Kaseya Case Update 2 | DIVD CSIRT","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-30116","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-30116","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"LEGACY","value":"Discovered by Wietse Boonstra of DIVD","lang":""},{"source":"LEGACY","value":"Additional research by Frank Breedijk of DIVD","lang":""}],"nvd_cpes":[{"cve_year":"2021","cve_id":"30116","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"kaseya","cpe5":"vsa","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"-","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"30116","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"kaseya","cpe5":"vsa_agent","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"30116","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"kaseya","cpe5":"vsa_server","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":{"cve_year":"2021","cve_id":"30116","cve":"CVE-2021-30116","vendorProject":"Kaseya","product":"Virtual System/Server Administrator (VSA)","vulnerabilityName":"Kaseya Virtual System/Server Administrator (VSA) Information Disclosure Vulnerability","dateAdded":"2021-11-03","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.","requiredAction":"Apply updates per vendor instructions.","dueDate":"2021-11-17","knownRansomwareCampaignUse":"Known","notes":"https://nvd.nist.gov/vuln/detail/CVE-2021-30116","cwes":"CWE-522","catalogVersion":"2026.07.22","updated_at":"2026-07-22 20:07:16"},"epss":{"cve_year":"2021","cve_id":"30116","cve":"CVE-2021-30116","epss":"0.856190000","percentile":"0.997020000","score_date":"2026-07-22","updated_at":"2026-07-23 00:09:34"},"legacy_qids":[{"cve":"CVE-2021-30116","qid":"730134","title":"Kaseya VSA Remote Code Execution Vulnerability (Zero Day)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2021-30116","STATE":"PUBLIC","TITLE":"Unauthenticated credential leak and business logic flaw in Kaseya VSA <= v9.5.6"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"credit":[{"lang":"eng","value":"Discovered by Wietse Boonstra of DIVD"},{"lang":"eng","value":"Additional research by Frank Breedijk of DIVD"}],"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","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."}]},"generator":{"engine":"Vulnogram 0.0.9"},"impact":{"cvss":{"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"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"name":"https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/","refsource":"CONFIRM","url":"https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/"},{"name":"https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021","refsource":"CONFIRM","url":"https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021"},{"name":"https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/","refsource":"CONFIRM","url":"https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/"},{"refsource":"MISC","name":"https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/","url":"https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/"}]},"solution":[{"lang":"eng","value":"Upgrade to a version after 9.5.6"}],"source":{"advisory":"DIVD-2021-00011","discovery":"INTERNAL"}},"nvd":{"publishedDate":"2021-07-09 14:15:00","lastModifiedDate":"2023-10-23 14:15:00","problem_types":["CWE-522"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL"},"exploitabilityScore":3.9,"impactScore":5.9},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":7.5},"severity":"HIGH","exploitabilityScore":10,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:kaseya:vsa_agent:*:*:*:*:*:*:*:*","versionEndExcluding":"9.5.0.24","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:kaseya:vsa_server:*:*:*:*:*:*:*:*","versionEndExcluding":"9.5.7a","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"30116","Ordinal":"205347","Title":"CVE-2021-30116","CVE":"CVE-2021-30116","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"30116","Ordinal":"1","NoteData":"Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"30116","Ordinal":"2","NoteData":"2021-07-09","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"30116","Ordinal":"3","NoteData":"2022-02-07","Type":"Other","Title":"Modified"}]}}}