CVE-2025-3935

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-3935", "assignerOrgId": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49", "state": "PUBLISHED", "assignerShortName": "ConnectWise", "dateReserved": "2025-04-25T14:32:25.365Z", "datePublished": "2025-04-25T18:27:44.244Z", "dateUpdated": "2026-02-26T18:28:01.567Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "platforms": ["Microsoft ASP.NET"], "product": "ScreenConnect", "vendor": "ConnectWise", "versions": [{"status": "affected", "version": "<25.2.3"}]}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<span style=\"background-color: rgb(255, 255, 255);\">ScreenConnect versions 25.2.3 and earlier versions may be susceptible to a ViewState code injection attack. ASP.NET Web Forms use ViewState to preserve page and control state, with data encoded using Base64 protected by machine keys.&nbsp;\n<span style=\"background-color: rgb(255, 255, 255);\">It is important to note that to obtain these machine keys, privileged system level access must be obtained. </span>\n\n</span><br><br>I<span style=\"background-color: rgb(255, 255, 255);\">f these machine keys are compromised, attackers could create and send a malicious ViewState to the website, potentially leading to remote code execution on the server.&nbsp;</span><span style=\"background-color: rgb(255, 255, 255);\"><br></span>\n\n<br>The risk does not originate from a vulnerability introduced by ScreenConnect, but from platform level behavior.&nbsp; This had no direct impact to ScreenConnect Client.&nbsp;<span style=\"background-color: rgb(255, 255, 255);\">ScreenConnect 2025.4 patch disables ViewState and removes any dependency on it. </span><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;</span>"}], "value": "ScreenConnect versions 25.2.3 and earlier versions may be susceptible to a ViewState code injection attack. ASP.NET Web Forms use ViewState to preserve page and control state, with data encoded using Base64 protected by machine keys.\u00a0\nIt is important to note that to obtain these machine keys, privileged system level access must be obtained. \n\n\n\nIf these machine keys are compromised, attackers could create and send a malicious ViewState to the website, potentially leading to remote code execution on the server.\u00a0\n\n\n\nThe risk does not originate from a vulnerability introduced by ScreenConnect, but from platform level behavior.\u00a0 This had no direct impact to ScreenConnect Client.\u00a0ScreenConnect 2025.4 patch disables ViewState and removes any dependency on it."}], "impacts": [{"capecId": "CAPEC-115", "descriptions": [{"lang": "en", "value": "CAPEC-115 Authentication Bypass"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-502", "description": "CWE-502 Deserialization of Untrusted Data", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49", "shortName": "ConnectWise", "dateUpdated": "2025-09-03T16:31:13.339Z"}, "references": [{"url": "https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4"}, {"url": "https://www.connectwise.com/company/trust/advisories"}], "solutions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p></p><b>Cloud:&nbsp;</b>No action is required. <br><br><b>On-premises:&nbsp;</b>Upgrade to the latest stable version.<br>\n\n\n\n\n\n\n\n\n\n<p>Details and guidance can be found here:\n\n<a target=\"_blank\" rel=\"nofollow\" href=\"https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4\">ScreenConnect 25.2.4 Security Patch</a>\n\n</p>\n\n\n\n\n<br>"}], "value": "Cloud:\u00a0No action is required. \n\nOn-premises:\u00a0Upgrade to the latest stable version.\n\n\n\n\n\n\n\n\n\n\nDetails and guidance can be found here:\n\n ScreenConnect 25.2.4 Security Patch https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4"}], "source": {"discovery": "UNKNOWN"}, "title": "ScreenConnect Exposure to ASP.NET ViewState Code Injection", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-3935", "role": "CISA Coordinator", "options": [{"Exploitation": "active"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-06-06T03:55:32.340641Z"}}}, {"other": {"type": "kev", "content": {"dateAdded": "2025-06-02", "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3935"}}}], "references": [{"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3935", "tags": ["government-resource"]}], "timeline": [{"time": "2025-06-02T00:00:00.000Z", "lang": "en", "value": "CVE-2025-3935 added to CISA KEV"}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-02-26T18:28:01.567Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-3935", "role": "CISA Coordinator", "options": [{"Exploitation": "active"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2025-06-06T03:55:32.340641Z"}}}, {"other": {"type": "kev", "content": {"dateAdded": "2025-06-02", "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3935"}}}], "timeline": [{"lang": "en", "time": "2025-06-02T00:00:00.000Z", "value": "CVE-2025-3935 added to CISA KEV"}], "references": [{"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3935", "tags": ["government-resource"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-04-25T18:55:48.517Z"}}], "cna": {"title": "ScreenConnect Exposure to ASP.NET ViewState Code Injection", "source": {"discovery": "UNKNOWN"}, "impacts": [{"capecId": "CAPEC-115", "descriptions": [{"lang": "en", "value": "CAPEC-115 Authentication Bypass"}]}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "ConnectWise", "product": "ScreenConnect", "versions": [{"status": "affected", "version": "<25.2.3"}], "platforms": ["Microsoft ASP.NET"], "defaultStatus": "unaffected"}], "solutions": [{"lang": "en", "value": "Cloud:\u00a0No action is required. \n\nOn-premises:\u00a0Upgrade to the latest stable version.\n\n\n\n\n\n\n\n\n\n\nDetails and guidance can be found here:\n\n ScreenConnect 25.2.4 Security Patch https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4", "supportingMedia": [{"type": "text/html", "value": "<p></p><b>Cloud:&nbsp;</b>No action is required. <br><br><b>On-premises:&nbsp;</b>Upgrade to the latest stable version.<br>\n\n\n\n\n\n\n\n\n\n<p>Details and guidance can be found here:\n\n<a target=\"_blank\" rel=\"nofollow\" href=\"https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4\">ScreenConnect 25.2.4 Security Patch</a>\n\n</p>\n\n\n\n\n<br>", "base64": false}]}], "references": [{"url": "https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4"}, {"url": "https://www.connectwise.com/company/trust/advisories"}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "descriptions": [{"lang": "en", "value": "ScreenConnect versions 25.2.3 and earlier versions may be susceptible to a ViewState code injection attack. ASP.NET Web Forms use ViewState to preserve page and control state, with data encoded using Base64 protected by machine keys.\u00a0\nIt is important to note that to obtain these machine keys, privileged system level access must be obtained. \n\n\n\nIf these machine keys are compromised, attackers could create and send a malicious ViewState to the website, potentially leading to remote code execution on the server.\u00a0\n\n\n\nThe risk does not originate from a vulnerability introduced by ScreenConnect, but from platform level behavior.\u00a0 This had no direct impact to ScreenConnect Client.\u00a0ScreenConnect 2025.4 patch disables ViewState and removes any dependency on it.", "supportingMedia": [{"type": "text/html", "value": "<span style=\"background-color: rgb(255, 255, 255);\">ScreenConnect versions 25.2.3 and earlier versions may be susceptible to a ViewState code injection attack. ASP.NET Web Forms use ViewState to preserve page and control state, with data encoded using Base64 protected by machine keys.&nbsp;\n<span style=\"background-color: rgb(255, 255, 255);\">It is important to note that to obtain these machine keys, privileged system level access must be obtained. </span>\n\n</span><br><br>I<span style=\"background-color: rgb(255, 255, 255);\">f these machine keys are compromised, attackers could create and send a malicious ViewState to the website, potentially leading to remote code execution on the server.&nbsp;</span><span style=\"background-color: rgb(255, 255, 255);\"><br></span>\n\n<br>The risk does not originate from a vulnerability introduced by ScreenConnect, but from platform level behavior.&nbsp; This had no direct impact to ScreenConnect Client.&nbsp;<span style=\"background-color: rgb(255, 255, 255);\">ScreenConnect 2025.4 patch disables ViewState and removes any dependency on it. </span><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;</span>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-502", "description": "CWE-502 Deserialization of Untrusted Data"}]}], "providerMetadata": {"orgId": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49", "shortName": "ConnectWise", "dateUpdated": "2025-09-03T16:31:13.339Z"}}}, "cveMetadata": {"cveId": "CVE-2025-3935", "state": "PUBLISHED", "dateUpdated": "2025-10-21T22:55:17.656Z", "dateReserved": "2025-04-25T14:32:25.365Z", "assignerOrgId": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49", "datePublished": "2025-04-25T18:27:44.244Z", "assignerShortName": "ConnectWise"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["Microsoft ASP.NET"], "product": "ScreenConnect", "vendor": "ConnectWise", "versions": [{"status": "affected", "version": "<25.2.3"}]}], "source": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49"}], "cisaActionDue": "2025-06-23", "cisaExploitAdd": "2025-06-02", "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.", "cisaVulnerabilityName": "ConnectWise ScreenConnect Improper Authentication Vulnerability", "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:connectwise:screenconnect:*:*:*:*:*:*:*:*", "matchCriteriaId": "552C1CC0-4F75-4C28-ACEF-EF1C1AD50EC2", "versionEndExcluding": "25.2.4", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "ScreenConnect versions 25.2.3 and earlier versions may be susceptible to a ViewState code injection attack. ASP.NET Web Forms use ViewState to preserve page and control state, with data encoded using Base64 protected by machine keys.\u00a0\nIt is important to note that to obtain these machine keys, privileged system level access must be obtained. \n\n\n\nIf these machine keys are compromised, attackers could create and send a malicious ViewState to the website, potentially leading to remote code execution on the server.\u00a0\n\n\n\nThe risk does not originate from a vulnerability introduced by ScreenConnect, but from platform level behavior.\u00a0 This had no direct impact to ScreenConnect Client.\u00a0ScreenConnect 2025.4 patch disables ViewState and removes any dependency on it."}, {"lang": "es", "value": "Las versiones 25.2.3 y anteriores de ScreenConnect pueden ser susceptibles a un ataque de inyecci\u00f3n de c\u00f3digo de ViewState. Los formularios web ASP.NET utilizan ViewState para preservar el estado de las p\u00e1ginas y los controles, con datos codificados en Base64 protegidos por claves de m\u00e1quina. Es importante tener en cuenta que para obtener estas claves de m\u00e1quina, se requiere acceso privilegiado al sistema. Si estas claves de m\u00e1quina se ven comprometidas, los atacantes podr\u00edan crear y enviar un ViewState malicioso al sitio web, lo que podr\u00eda provocar la ejecuci\u00f3n remota de c\u00f3digo en el servidor. El riesgo no se debe a una vulnerabilidad introducida por ScreenConnect, sino a un comportamiento a nivel de plataforma. Esto no tuvo un impacto directo en el cliente de ScreenConnect. El parche 2025.4 de ScreenConnect deshabilita ViewState y elimina cualquier dependencia de \u00e9l."}], "id": "CVE-2025-3935", "lastModified": "2026-06-17T09:20:57.337", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-3935", "options": [{"exploitation": "active"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-06-06T03:55:32.340641Z", "version": "2.0.3"}}]}, "published": "2025-04-25T19:15:49.143", "references": [{"source": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49", "tags": ["Vendor Advisory"], "url": "https://www.connectwise.com/company/trust/advisories"}, {"source": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49", "tags": ["Vendor Advisory"], "url": "https://www.connectwise.com/company/trust/security-bulletins/screenconnect-security-patch-2025.4"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["US Government Resource"], "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-3935"}], "sourceIdentifier": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-502"}], "source": "7d616e1a-3288-43b1-a0dd-0a65d3e70a49", "type": "Secondary"}]}

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