{"api_version":"1","generated_at":"2026-07-24T21:43:06+00:00","cve":"CVE-2015-8555","urls":{"html":"https://cve.report/CVE-2015-8555","api":"https://cve.report/api/cve/CVE-2015-8555.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2015-8555","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2015-8555"},"summary":{"title":"CVE-2015-8555","description":"Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via unspecified vectors.","state":"PUBLISHED","assigner":"mitre","published_at":"2016-04-13 15:59:08","updated_at":"2026-05-06 22:30:45"},"problem_types":["CWE-200","n/a"],"metrics":[{"version":"3.0","source":"nvd@nist.gov","type":"Primary","score":"8.6","severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","data":{"version":"3.0","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","baseScore":8.6,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"}},{"version":"2.0","source":"nvd@nist.gov","type":"Primary","score":"5","severity":"","vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","data":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:N/A:N","baseScore":5,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"NONE","availabilityImpact":"NONE"}}],"references":[{"url":"http://www.debian.org/security/2016/dsa-3519","name":"http://www.debian.org/security/2016/dsa-3519","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"Debian -- Security Information -- DSA-3519-1 xen","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html","name":"http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"Oracle VM Server for x86 Bulletin - July 2016","mime":"text/html","httpstatus":"-1","archivestatus":"200"},{"url":"http://www.securityfocus.com/bid/79543","name":"http://www.securityfocus.com/bid/79543","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"Xen CVE-2015-8555 Information Disclosure Vulnerability","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"http://xenbits.xen.org/xsa/advisory-165.html","name":"http://xenbits.xen.org/xsa/advisory-165.html","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Vendor Advisory"],"title":"XSA-165 - Xen Security Advisories","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://support.citrix.com/article/CTX203879","name":"http://support.citrix.com/article/CTX203879","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"Citrix XenServer Multiple Security Updates","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://security.gentoo.org/glsa/201604-03","name":"https://security.gentoo.org/glsa/201604-03","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"Xen: Multiple vulnerabilities (GLSA 201604-03) — Gentoo Security","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"http://www.securitytracker.com/id/1034477","name":"http://www.securitytracker.com/id/1034477","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"Xen x86 FPU/XMM Stack/Register Initialization Flaw Lets Local Users on a Guest System Obtain Potentially Sensitive Information from Other Domains on the Target System - SecurityTracker","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2015-8555","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2015-8555","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"n/a","product":"n/a","version":"affected n/a","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"citrix","cpe5":"xenserver","cpe6":"6.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.3.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.3.1","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.3.2","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.3.3","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.3.4","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.4.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.4.1","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.4.2","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.4.3","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.4.4","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.5.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.5.1","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.5.2","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.5.3","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.6.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2015","cve_id":"8555","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"xen","cpe5":"xen","cpe6":"4.6.1","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"providerMetadata":{"dateUpdated":"2024-08-06T08:20:43.162Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"tags":["x_refsource_CONFIRM","x_transferred"],"url":"http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html"},{"name":"DSA-3519","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred"],"url":"http://www.debian.org/security/2016/dsa-3519"},{"name":"1034477","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred"],"url":"http://www.securitytracker.com/id/1034477"},{"name":"79543","tags":["vdb-entry","x_refsource_BID","x_transferred"],"url":"http://www.securityfocus.com/bid/79543"},{"tags":["x_refsource_CONFIRM","x_transferred"],"url":"http://xenbits.xen.org/xsa/advisory-165.html"},{"name":"GLSA-201604-03","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred"],"url":"https://security.gentoo.org/glsa/201604-03"},{"tags":["x_refsource_CONFIRM","x_transferred"],"url":"http://support.citrix.com/article/CTX203879"}],"title":"CVE Program Container"}],"cna":{"affected":[{"product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}]}],"datePublic":"2015-12-17T00:00:00.000Z","descriptions":[{"lang":"en","value":"Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via unspecified vectors."}],"problemTypes":[{"descriptions":[{"description":"n/a","lang":"en","type":"text"}]}],"providerMetadata":{"dateUpdated":"2017-06-30T16:57:01.000Z","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","shortName":"mitre"},"references":[{"tags":["x_refsource_CONFIRM"],"url":"http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html"},{"name":"DSA-3519","tags":["vendor-advisory","x_refsource_DEBIAN"],"url":"http://www.debian.org/security/2016/dsa-3519"},{"name":"1034477","tags":["vdb-entry","x_refsource_SECTRACK"],"url":"http://www.securitytracker.com/id/1034477"},{"name":"79543","tags":["vdb-entry","x_refsource_BID"],"url":"http://www.securityfocus.com/bid/79543"},{"tags":["x_refsource_CONFIRM"],"url":"http://xenbits.xen.org/xsa/advisory-165.html"},{"name":"GLSA-201604-03","tags":["vendor-advisory","x_refsource_GENTOO"],"url":"https://security.gentoo.org/glsa/201604-03"},{"tags":["x_refsource_CONFIRM"],"url":"http://support.citrix.com/article/CTX203879"}],"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2015-8555","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via unspecified vectors."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"name":"http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html","refsource":"CONFIRM","url":"http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html"},{"name":"DSA-3519","refsource":"DEBIAN","url":"http://www.debian.org/security/2016/dsa-3519"},{"name":"1034477","refsource":"SECTRACK","url":"http://www.securitytracker.com/id/1034477"},{"name":"79543","refsource":"BID","url":"http://www.securityfocus.com/bid/79543"},{"name":"http://xenbits.xen.org/xsa/advisory-165.html","refsource":"CONFIRM","url":"http://xenbits.xen.org/xsa/advisory-165.html"},{"name":"GLSA-201604-03","refsource":"GENTOO","url":"https://security.gentoo.org/glsa/201604-03"},{"name":"http://support.citrix.com/article/CTX203879","refsource":"CONFIRM","url":"http://support.citrix.com/article/CTX203879"}]}}}},"cveMetadata":{"assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","assignerShortName":"mitre","cveId":"CVE-2015-8555","datePublished":"2016-04-13T15:00:00.000Z","dateReserved":"2015-12-14T00:00:00.000Z","dateUpdated":"2024-08-06T08:20:43.162Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.1"},"nvd":{"publishedDate":"2016-04-13 15:59:08","lastModifiedDate":"2026-05-06 22:30:45","problem_types":["CWE-200","n/a"],"metrics":{"cvssMetricV30":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.0","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","baseScore":8.6,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":4}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:N/A:N","baseScore":5,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"NONE","availabilityImpact":"NONE"},"baseSeverity":"MEDIUM","exploitabilityScore":10,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:citrix:xenserver:6.0:*:*:*:*:*:*:*","matchCriteriaId":"9C1D10B8-202D-44A4-A872-88D7C11488D1"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.3.0:*:*:*:*:*:*:*","matchCriteriaId":"BF948E6A-07BE-4C7D-8A98-002E89D35F4D"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.3.1:*:*:*:*:*:*:*","matchCriteriaId":"C0E23B94-1726-4F63-84BB-8D83FAB156D7"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.3.2:*:*:*:*:*:*:*","matchCriteriaId":"C76124AB-4E3D-4BE0-AAEA-7FC05868E2FB"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.3.3:*:*:*:*:*:*:*","matchCriteriaId":"F30B5EF5-0AE8-420B-A103-B1B25A372F09"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.3.4:*:*:*:*:*:*:*","matchCriteriaId":"F784EF07-DBEC-492A-A0F4-F9F7B2551A0B"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.4.0:*:*:*:*:*:*:*","matchCriteriaId":"1044792C-D544-457C-9391-4F3B5BAB978D"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.4.1:*:*:*:*:*:*:*","matchCriteriaId":"FBD9AD01-50B7-4951-8A73-A6CF4801A487"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.4.2:*:*:*:*:*:*:*","matchCriteriaId":"89AA8FD5-E997-4F0D-AFB6-FFBE0073BA5D"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.4.3:*:*:*:*:*:*:*","matchCriteriaId":"75615D84-9CA1-456C-816D-768E37B074A4"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.4.4:*:*:*:*:*:*:*","matchCriteriaId":"7AB87384-A1F8-4136-A242-441C655D9364"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.5.0:*:*:*:*:*:*:*","matchCriteriaId":"90CCECD0-C0F9-45A8-8699-64428637EBCA"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.5.1:*:*:*:*:*:*:*","matchCriteriaId":"F0ED340C-6746-471E-9F2D-19D62D224B7A"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.5.2:*:*:*:*:*:*:*","matchCriteriaId":"99BD7C4F-DE4C-4508-B20D-46A94B616C5B"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.5.3:*:*:*:*:*:*:*","matchCriteriaId":"3374F1FB-70F9-4EBC-837B-0D42282E3E5F"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.6.0:*:*:*:*:*:*:*","matchCriteriaId":"4B6F7CE9-C409-4D88-9A99-B21420633F45"},{"vulnerable":true,"criteria":"cpe:2.3:o:xen:xen:4.6.1:*:*:*:*:*:*:*","matchCriteriaId":"B814C381-4991-495A-B530-7543F977B346"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2015","CveId":"8555","Ordinal":"1","Title":"CVE-2015-8555","CVE":"CVE-2015-8555","Year":"2015"},"notes":[{"CveYear":"2015","CveId":"8555","Ordinal":"1","NoteData":"Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via unspecified vectors.","Type":"Description","Title":"CVE-2015-8555"},{"CveYear":"2015","CveId":"8555","Ordinal":"2","NoteData":"2016-04-13","Type":"Other","Title":"Published"},{"CveYear":"2015","CveId":"8555","Ordinal":"3","NoteData":"2017-06-30","Type":"Other","Title":"Modified"}]}}}