CVE-2021-42785

{"containers": {"cna": {"affected": [{"product": "TightVNC Viewer", "vendor": "GlavSoft LLC", "versions": [{"lessThanOrEqual": "2.8.59", "status": "affected", "version": "2.8.59", "versionType": "custom"}]}], "credits": [{"lang": "en", "value": "Eugene Lim from Government Technology Agency of Singapore"}], "descriptions": [{"lang": "en", "value": "Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-120", "description": "CWE-120 Buffer Overflow", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-11-23T21:37:07.000Z", "orgId": "1a37b84a-8e51-4525-b3d6-87e2fae01dbd", "shortName": "GovTech CSG"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://www.tightvnc.com/whatsnew.php"}], "source": {"discovery": "EXTERNAL"}, "title": "Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59", "x_generator": {"engine": "Vulnogram 0.0.9"}, "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "cve_disclosure@tech.gov.sg", "ID": "CVE-2021-42785", "STATE": "PUBLIC", "TITLE": "Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "TightVNC Viewer", "version": {"version_data": [{"version_affected": "<=", "version_name": "2.8.59", "version_value": "2.8.59"}]}}]}, "vendor_name": "GlavSoft LLC"}]}}, "credit": [{"lang": "eng", "value": "Eugene Lim from Government Technology Agency of Singapore"}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server."}]}, "generator": {"engine": "Vulnogram 0.0.9"}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-120 Buffer Overflow"}]}]}, "references": {"reference_data": [{"name": "https://www.tightvnc.com/whatsnew.php", "refsource": "MISC", "url": "https://www.tightvnc.com/whatsnew.php"}]}, "source": {"discovery": "EXTERNAL"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T03:38:50.226Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://www.tightvnc.com/whatsnew.php"}]}]}, "cveMetadata": {"assignerOrgId": "1a37b84a-8e51-4525-b3d6-87e2fae01dbd", "assignerShortName": "GovTech CSG", "cveId": "CVE-2021-42785", "datePublished": "2021-11-23T21:37:07.000Z", "dateReserved": "2021-10-21T00:00:00.000Z", "dateUpdated": "2024-08-04T03:38:50.226Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "TightVNC Viewer", "vendor": "GlavSoft LLC", "versions": [{"lessThanOrEqual": "2.8.59", "status": "affected", "version": "2.8.59", "versionType": "custom"}]}], "source": "cve_disclosure@tech.gov.sg"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:tightvnc:tightvnc:*:*:*:*:*:*:*:*", "matchCriteriaId": "E9227D38-8A36-4104-8703-77E0B93E1E43", "versionEndIncluding": "2.8.59", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server."}, {"lang": "es", "value": "Una vulnerabilidad de desbordamiento del b\u00fafer en el archivo tvnviewer.exe de TightVNC Viewer permite a un atacante remoto ejecutar instrucciones arbitrarias por medio de un paquete FramebufferUpdate dise\u00f1ado desde un servidor VNC"}], "id": "CVE-2021-42785", "lastModified": "2026-06-17T04:10:08.660", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 7.5, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-11-23T22:15:08.133", "references": [{"source": "cve_disclosure@tech.gov.sg", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://www.tightvnc.com/whatsnew.php"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://www.tightvnc.com/whatsnew.php"}], "sourceIdentifier": "cve_disclosure@tech.gov.sg", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-120"}], "source": "cve_disclosure@tech.gov.sg", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-120"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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