VULNERABILITY INTELLIGENCE

CVE-2021-3682

CVSS score8.5 HIGH
EPSS probability2.88%
CISA KEVNot currently listed
Published2021-08-05
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Description

A flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2. It occurs when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. A malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata, resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the host.

Weakness classification

  • secalert@redhat.com: CWE-763
  • nvd@nist.gov: CWE-763

Primary references