{"cve":"CVE-2021-33656","nvd":{"published":"2022-07-18T15:15:08.043","modified":"2026-10-08T22:17:10.127","status":"Modified","description":"When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":6.8},"cwes":["CWE-787"],"references":["http://www.openwall.com/lists/oss-security/2022/07/19/3","https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch","https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html","https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel","http://www.openwall.com/lists/oss-security/2022/07/19/3"],"products":["debian:debian_linux","linux:linux_kernel","openatom:openeuler"],"source":"nvd","synced_at":"2026-10-19T21:33:44.859608815+00:00"},"epss":{"cve":"CVE-2021-33656","score":0.00611,"percentile":0.48979,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}