{"api_version":"1","generated_at":"2026-07-23T19:19:43+00:00","cve":"CVE-2021-34856","urls":{"html":"https://cve.report/CVE-2021-34856","api":"https://cve.report/api/cve/CVE-2021-34856.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-34856","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-34856"},"summary":{"title":"CVE-2021-34856","description":"This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.1.3 (49160). An attacker must first obtain the ability to execute high-privileged code on the target guest system in order to exploit this vulnerability. The specific flaw exists within the virtio-gpu virtual device. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor. 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Was ZDI-CAN-13581."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer"}]}]},"references":{"reference_data":[{"url":"https://kb.parallels.com/125013","refsource":"MISC","name":"https://kb.parallels.com/125013"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-21-938/","refsource":"MISC","name":"https://www.zerodayinitiative.com/advisories/ZDI-21-938/"}]},"impact":{"cvss":{"vectorString":"CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.0"}}},"nvd":{"publishedDate":"2021-10-25 17:15:00","lastModifiedDate":"2022-10-24 14:23:00","problem_types":["CWE-787"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH"},"exploitabilityScore":2,"impactScore":6},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:L/AC:L/Au:N/C:P/I:P/A:P","accessVector":"LOCAL","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":4.6},"severity":"MEDIUM","exploitabilityScore":3.9,"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:parallels:parallels_desktop:16.1.3:*:*:*:*:macos:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"34856","Ordinal":"210336","Title":"CVE-2021-34856","CVE":"CVE-2021-34856","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"34856","Ordinal":"1","NoteData":"This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.1.3 (49160). An attacker must first obtain the ability to execute high-privileged code on the target guest system in order to exploit this vulnerability. The specific flaw exists within the virtio-gpu virtual device. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor. Was ZDI-CAN-13581.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"34856","Ordinal":"2","NoteData":"2021-10-25","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"34856","Ordinal":"3","NoteData":"2021-10-25","Type":"Other","Title":"Modified"}]}}}