{"id":"CVE-2021-33656","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-33656","generatedAt":"2026-10-27T20:19:58.929Z","title":"When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.","description":"When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.","published":"2022-07-18T15:15:08.000Z","lastModified":"2026-10-08T22:17:10.000Z","status":"Modified","sourceIdentifier":"securities@openeuler.org","cvss":{"version":"3.1","score":6.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-787"],"affected":["openatom/openeuler","linux/linux kernel","debian/debian linux"],"epss":{"score":0.00611,"percentile":0.48996,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.61%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://www.openwall.com/lists/oss-security/2022/07/19/3","tags":["Mailing List","Patch","Third Party Advisory"],"source":"securities@openeuler.org"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch","tags":["Patch","Third Party Advisory"],"source":"securities@openeuler.org"},{"url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html","tags":["Mailing List","Third Party Advisory"],"source":"securities@openeuler.org"},{"url":"https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel","tags":["Third Party Advisory"],"source":"securities@openeuler.org"},{"url":"http://www.openwall.com/lists/oss-security/2022/07/19/3","tags":["Mailing List","Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-33656","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."}