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Vulnerability details: VCID-au4w-wt7d-37h4
Vulnerability ID VCID-au4w-wt7d-37h4
Aliases CVE-2015-8555
Summary information leak in legacy x86 FPU/XMM initialization
Status Published
Exploitability 0.5
Weighted Severity 7.7
Risk 3.9
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
System Score Found at
epss 0.00551 https://api.first.org/data/v1/epss?cve=CVE-2015-8555
epss 0.00551 https://api.first.org/data/v1/epss?cve=CVE-2015-8555
epss 0.00551 https://api.first.org/data/v1/epss?cve=CVE-2015-8555
epss 0.00551 https://api.first.org/data/v1/epss?cve=CVE-2015-8555
epss 0.00551 https://api.first.org/data/v1/epss?cve=CVE-2015-8555
epss 0.00551 https://api.first.org/data/v1/epss?cve=CVE-2015-8555
epss 0.00551 https://api.first.org/data/v1/epss?cve=CVE-2015-8555
epss 0.00551 https://api.first.org/data/v1/epss?cve=CVE-2015-8555
epss 0.00551 https://api.first.org/data/v1/epss?cve=CVE-2015-8555
epss 0.00551 https://api.first.org/data/v1/epss?cve=CVE-2015-8555
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2015-8555
cvssv3 8.6 https://nvd.nist.gov/vuln/detail/CVE-2015-8555
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2015-8555.json
https://api.first.org/data/v1/epss?cve=CVE-2015-8555
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8339
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8340
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8341
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8550
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8555
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1570
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1571
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2270
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2271
http://support.citrix.com/article/CTX203879
http://www.debian.org/security/2016/dsa-3519
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
http://www.securityfocus.com/bid/79543
http://www.securitytracker.com/id/1034477
http://xenbits.xen.org/xsa/advisory-165.html
1289130 https://bugzilla.redhat.com/show_bug.cgi?id=1289130
823620 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=823620
cpe:2.3:a:citrix:xenserver:6.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:citrix:xenserver:6.0:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.3.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.3.0:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.3.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.3.1:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.3.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.3.2:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.3.3:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.3.3:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.3.4:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.3.4:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.4.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.4.0:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.4.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.4.1:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.4.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.4.2:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.4.3:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.4.3:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.4.4:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.4.4:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.5.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.5.0:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.5.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.5.1:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.5.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.5.2:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.5.3:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.5.3:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.6.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.6.0:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.6.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:xen:xen:4.6.1:*:*:*:*:*:*:*
CVE-2015-8555 https://nvd.nist.gov/vuln/detail/CVE-2015-8555
GLSA-201604-03 https://security.gentoo.org/glsa/201604-03
XSA-165 https://xenbits.xen.org/xsa/advisory-165.html
No exploits are available.
Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2015-8555
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2015-8555
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.67932
EPSS Score 0.00551
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:37:48.726357+00:00 Xen Importer Import https://xenbits.xen.org/xsa/advisory-165.html 38.0.0