CVE-2021-20181

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    CVE-2021-20181

    Published: 13 May 2021Last Modified: 8 Jul 2026

    Summary:

    Details: A race condition flaw was found in the 9pfs server implementation of QEMU up to and including 5.2.0. This flaw allows a malicious 9p client to cause a use-after-free error, potentially escalating their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.

    References: https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html, https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html, https://security.netapp.com/advisory/ntap-20210720-0009/, https://www.zerodayinitiative.com/advisories/ZDI-21-159/, https://bugzilla.redhat.com/show_bug.cgi?id=1927007

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    v5.2.0
    v5.2.0-rc4
    v5.2.0-rc3
    v5.2.0-rc2
    v5.2.0-rc1
    v5.2.0-rc0

    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-2021-20181 | CVE-DB