{"cve":"CVE-2021-3409","nvd":{"published":"2021-03-23T21:15:14.697","modified":"2026-06-17T04:05:02.463","status":"Modified","description":"The patch for CVE-2020-17380/CVE-2020-25085 was found to be ineffective, thus making QEMU vulnerable to the out-of-bounds read/write access issues previously found in the SDHCI controller emulation code. This flaw allows a malicious privileged guest to crash the QEMU process on the host, resulting in a denial of service or potential code execution. QEMU up to (including) 5.2.0 is affected by this.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L","score":5.7},"cwes":["CWE-119"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1928146","https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html","https://security.gentoo.org/glsa/202208-27","https://security.netapp.com/advisory/ntap-20210507-0001/","https://www.openwall.com/lists/oss-security/2021/03/09/1"],"products":["debian:debian_linux","fedoraproject:fedora","qemu:qemu","redhat:enterprise_linux"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-3409","score":0.00489,"percentile":0.42134,"date":"2026-10-31"},"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."]}