{"api_version":"1","generated_at":"2026-04-22T23:31:05+00:00","cve":"CVE-2021-28712","urls":{"html":"https://cve.report/CVE-2021-28712","api":"https://cve.report/api/cve/CVE-2021-28712.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-28712","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-28712"},"summary":{"title":"CVE-2021-28712","description":"Rogue backends can cause DoS of guests via high frequency events T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen offers the ability to run PV backends in regular unprivileged guests, typically referred to as \"driver domains\". Running PV backends in driver domains has one primary security advantage: if a driver domain gets compromised, it doesn't have the privileges to take over the system. 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The\nvulnerability is not affecting the host, but the guests."}]}}},"credit":{"credit_data":{"description":{"description_data":[{"lang":"eng","value":"This issue was discovered by Jürgen Groß of SUSE."}]}}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Rogue backends can cause DoS of guests via high frequency events T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen offers the ability to run PV backends in regular unprivileged guests, typically referred to as \"driver domains\". Running PV backends in driver domains has one primary security advantage: if a driver domain gets compromised, it doesn't have the privileges to take over the system. However, a malicious driver domain could try to attack other guests via sending events at a high frequency leading to a Denial of Service in the guest due to trying to service interrupts for elongated amounts of time. There are three affected backends: * blkfront patch 1, CVE-2021-28711 * netfront patch 2, CVE-2021-28712 * hvc_xen (console) patch 3, CVE-2021-28713"}]},"impact":{"impact_data":{"description":{"description_data":[{"lang":"eng","value":"Potentially malicious PV backends can cause guest DoS due to unhardened\nfrontends in the guests, even though this ought to have been prevented by\ncontaining them within a driver domain."}]}}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"unknown"}]}]},"references":{"reference_data":[{"url":"https://xenbits.xenproject.org/xsa/advisory-391.txt","refsource":"MISC","name":"https://xenbits.xenproject.org/xsa/advisory-391.txt"},{"refsource":"DEBIAN","name":"DSA-5050","url":"https://www.debian.org/security/2022/dsa-5050"},{"refsource":"MLIST","name":"[debian-lts-announce] 20220309 [SECURITY] [DLA 2940-1] linux security update","url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html"},{"refsource":"MLIST","name":"[debian-lts-announce] 20220309 [SECURITY] [DLA 2941-1] linux-4.19 security update","url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html"},{"refsource":"DEBIAN","name":"DSA-5096","url":"https://www.debian.org/security/2022/dsa-5096"}]},"workaround":{"workaround_data":{"description":{"description_data":[{"lang":"eng","value":"There is no known mitigation available."}]}}}},"nvd":{"publishedDate":"2022-01-05 17:15:00","lastModifiedDate":"2022-04-06 16:33:00","problem_types":["NVD-CWE-noinfo"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM"},"exploitabilityScore":2,"impactScore":4},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:L/AC:L/Au:N/C:N/I:N/A:P","accessVector":"LOCAL","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL","baseScore":2.1},"severity":"LOW","exploitabilityScore":3.9,"impactScore":2.9,"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:o:xen:xen:-:*:*:*:*:*:*:*","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"28712","Ordinal":"203888","Title":"CVE-2021-28712","CVE":"CVE-2021-28712","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"28712","Ordinal":"1","NoteData":"Rogue backends can cause DoS of guests via high frequency events T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen offers the ability to run PV backends in regular unprivileged guests, typically referred to as \"driver domains\". Running PV backends in driver domains has one primary security advantage: if a driver domain gets compromised, it doesn't have the privileges to take over the system. However, a malicious driver domain could try to attack other guests via sending events at a high frequency leading to a Denial of Service in the guest due to trying to service interrupts for elongated amounts of time. There are three affected backends: * blkfront patch 1, CVE-2021-28711 * netfront patch 2, CVE-2021-28712 * hvc_xen (console) patch 3, CVE-2021-28713","Type":"Description","Title":null},{"CveYear":"2021","CveId":"28712","Ordinal":"2","NoteData":"2022-01-05","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"28712","Ordinal":"3","NoteData":"2022-01-21","Type":"Other","Title":"Modified"}]}}}