CVE-2021-3682

    Dashboard / Vulnerabilities / CVE-2021-3682

    CVE-2021-3682

    Published: 5 Aug 2021Last Modified: 8 Jul 2026

    Summary:

    Details: 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.

    References: 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-20210902-0006/, https://www.debian.org/security/2021/dsa-4980, https://bugzilla.redhat.com/show_bug.cgi?id=1989651

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -f9baca549e44791be0dd98de15add3d8452a8af0

    Affected versions

    6.1.0-rc1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-3682 | CVE-DB