{"schemaVersion":3,"id":"CVE-2017-13721","aliases":["ALPINE-CVE-2017-13721","UBUNTU-CVE-2017-13721","DEBIAN-CVE-2017-13721"],"status":"published","duplicateOf":null,"title":null,"description":"In X.Org Server (aka xserver and xorg-server) before 1.19.4, an attacker authenticated to an X server with the X shared memory extension enabled can cause aborts of the X server or replace shared memory segments of other X clients in the same session.","dates":{"published":"2017-10-09T14:00:00.000Z","modified":"2024-08-05T19:05:20.137Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.7,"severity":"medium","version":"3.0","versionLabel":"v3.0","source":"NVD","vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":4.7,"severity":"medium","vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":1.9,"severity":"low","vector":"AV:L/AC:M/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"OSV · Alpine","score":4.7,"severity":"medium","vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","exploitability":2.6,"impact":6,"computed":true},{"version":"3.0","versionLabel":"v3.0","source":"OSV · Ubuntu","score":4.7,"severity":"medium","vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","exploitability":2.6,"impact":6,"computed":true},{"version":"3.0","versionLabel":"v3.0","source":"OSV · Debian","score":4.7,"severity":"medium","vector":"CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","exploitability":2.6,"impact":6,"computed":true}]},"epss":{"probability":0.00357,"percentile":0.27943,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00357},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00357,"percentile":0.27943}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00403,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00357,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00357,"percentile":0.27943}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-269","name":"Improper Privilege Management","description":"The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.","type":"weakness","status":"Draft","abstraction":"Class","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/269.html"}],"affected":[{"vendor":"alpine","product":"xorg-server","name":"xorg-server","label":"xorg-server","ecosystem":"Alpine Linux","cpePart":null,"purl":"pkg:apk/alpine/xorg-server","purlType":"apk","versions":[{"text":"< 1.19.5-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.19.5-r0","eol":null,"hubHref":null},{"vendor":"debian","product":"xorg-server","name":"xorg-server","label":"xorg-server","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/xorg-server","purlType":"deb","versions":[{"text":"< 2:1.19.4-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2:1.19.4-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"xorg-server","name":"xorg-server","label":"xorg-server","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/xorg-server","purlType":"deb","versions":[{"text":"< 2:1.15.1-0ubuntu2.10","noFixRecorded":false,"fixedIn":null},{"text":"< 2:1.18.4-0ubuntu0.6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2:1.15.1-0ubuntu2.10 | < 2:1.18.4-0ubuntu0.6","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"xorg-server-hwe-16.04","name":"xorg-server-hwe-16.04","label":"xorg-server-hwe-16.04","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/xorg-server-hwe-16.04","purlType":"deb","versions":[{"text":"< 2:1.19.3-1ubuntu1~16.04.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2:1.19.3-1ubuntu1~16.04.3","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"xorg-server-lts-xenial","name":"xorg-server-lts-xenial","label":"xorg-server-lts-xenial","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/xorg-server-lts-xenial","purlType":"deb","versions":[{"text":"< 2:1.18.3-1ubuntu2.3~trusty3","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2:1.18.3-1ubuntu2.3~trusty3","eol":null,"hubHref":null},{"vendor":"debian","product":"debian_linux","name":"debian linux","label":"debian_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"8.0","noFixRecorded":false,"fixedIn":null},{"text":"9.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"8.0 | 9.0","eol":{"isEol":true,"eolDate":"2020-06-30T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"8","label":"8 (Jessie)","eolFrom":"2020-06-30T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":"8.11"},"product":{"name":"debian","label":"Debian","category":"os"}},"hubHref":"/vendor/debian/debian_linux"},{"vendor":"x.org","product":"x_server","name":"x server","label":"x_server","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 1.19.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 1.19.3","eol":null,"hubHref":"/vendor/xorg/x_server"}],"affectedCount":7,"eol":{"hasEol":true,"count":1},"references":[{"url":"https://cgit.freedesktop.org/xorg/xserver/commit/?id=b95f25af141d33a65f6f821ea9c003f66a01e1f1","label":"cgit.freedesktop.org/xorg/xserver/commit/?id=b95f25af141d33a65f6f821ea9c003f66a01e1f1","hostname":"cgit.freedesktop.org","tags":["X Refsource CONFIRM","Third Party Advisory"]},{"url":"https://security.gentoo.org/glsa/201710-30","label":"security.gentoo.org/glsa/201710-30","hostname":"security.gentoo.org","tags":["Vendor Advisory","X Refsource GENTOO","Third Party Advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2017/10/04/10","label":"www.openwall.com/lists/oss-security/2017/10/04/10","hostname":"www.openwall.com","tags":["Mailing List","X Refsource MLIST","Third Party Advisory"]},{"url":"http://www.securityfocus.com/bid/101238","label":"www.securityfocus.com/bid/101238","hostname":"www.securityfocus.com","tags":["VDB Entry","X Refsource BID","Third Party Advisory"]},{"url":"http://www.debian.org/security/2017/dsa-4000","label":"www.debian.org/security/2017/dsa-4000","hostname":"www.debian.org","tags":["Vendor Advisory","X Refsource DEBIAN","Third Party Advisory"]},{"url":"https://lists.x.org/archives/xorg-announce/2017-October/002808.html","label":"lists.x.org/archives/xorg-announce/2017-October/002808.html","hostname":"lists.x.org","tags":["Mailing List","X Refsource MLIST","Vendor Advisory"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2017-13721","label":"security.alpinelinux.org/vuln/CVE-2017-13721","hostname":"security.alpinelinux.org","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2017-13721","label":"ubuntu.com/security/CVE-2017-13721","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"http://seclists.org/oss-sec/2017/q4/31","label":"seclists.org/oss-sec/2017/q4/31","hostname":"seclists.org","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-3453-1","label":"ubuntu.com/security/notices/USN-3453-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2017-13721","label":"www.cve.org/CVERecord?id=CVE-2017-13721","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2017-13721","label":"security-tracker.debian.org/tracker/CVE-2017-13721","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DSA-4000-1","MGASA-2017-0366","OPENSUSE-SU-2024:11525-1","SUSE-SU-2017:3047-1","USN-3453-1"],"duplicates":[],"related":["OPENSUSE-SU-2024:11525-1","SUSE-SU-2017:3047-1","USN-3453-1"]},"timeline":[{"kind":"published","date":"2017-10-09T14:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-05T19:05:20.137Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":19,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T12:45:52.700Z","stale":false,"partial":false}}