{"id":"CVE-2017-10917","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-10917","generatedAt":"2026-10-28T21:31:15.677Z","title":"Xen through 4.8.x does not validate the port numbers of polled event channel ports, which allows guest OS users to cause a denial of service (NULL pointer dereference and host OS crash) or possibly obtain sensitive information, aka XSA-221.","description":"Xen through 4.8.x does not validate the port numbers of polled event channel ports, which allows guest OS users to cause a denial of service (NULL pointer dereference and host OS crash) or possibly obtain sensitive information, aka XSA-221.","published":"2017-07-05T01:29:01.000Z","lastModified":"2026-06-17T01:00:55.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":9.1,"severity":"CRITICAL","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"},"cwe":["CWE-476"],"affected":["xen/xen"],"epss":{"score":0.02567,"percentile":0.8505,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.57%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://www.debian.org/security/2017/dsa-3969","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/99157","source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1038731","source":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/201708-03","source":"cve@mitre.org"},{"url":"https://xenbits.xen.org/xsa/advisory-221.html","tags":["Mailing List","Mitigation","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://www.debian.org/security/2017/dsa-3969","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/99157","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1038731","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/201708-03","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://xenbits.xen.org/xsa/advisory-221.html","tags":["Mailing List","Mitigation","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-10917","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}