{"cve":"CVE-2021-3713","nvd":{"published":"2021-08-25T19:15:15.073","modified":"2026-06-17T04:05:37.387","status":"Modified","description":"An out-of-bounds write flaw was found in the UAS (USB Attached SCSI) device emulation of QEMU in versions prior to 6.2.0-rc0. The device uses the guest supplied stream number unchecked, which can lead to out-of-bounds access to the UASDevice->data3 and UASDevice->status3 fields. A malicious guest user could use this flaw to crash QEMU or potentially achieve code execution with the privileges of the QEMU process on the host.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":7.4},"cwes":["CWE-787"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1994640","https://lists.debian.org/debian-lts-announce/2021/09/msg00000.html","https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html","https://security.gentoo.org/glsa/202208-27","https://security.netapp.com/advisory/ntap-20210923-0006/"],"products":["debian:debian_linux","qemu:qemu"],"source":"nvd","synced_at":"2026-10-19T21:21:57.125947417+00:00"},"epss":{"cve":"CVE-2021-3713","score":0.00568,"percentile":0.47091,"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."]}