CVE-2021-3593

    Dashboard / Vulnerabilities / CVE-2021-3593

    CVE-2021-3593

    Published: 15 Jun 2021Last Modified: 7 Aug 2026

    Summary:

    Details: An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw exists in the udp6_input() function and could occur while processing a udp packet that is smaller than the size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw affects libslirp versions prior to 4.6.0.

    References: https://lists.debian.org/debian-lts-announce/2023/03/msg00013.html, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GCKWZWY64EHTOQMLVLTSZ4AA27EWRJMH/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SGPQZFVJCFGDSISFXPCQTTBBD7QZLJKI/, https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html, https://security.gentoo.org/glsa/202107-44, https://security.netapp.com/advisory/ntap-20210805-0004/, https://bugzilla.redhat.com/show_bug.cgi?id=1970487

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -6ef66db79938d763212320c1b64bc562c23d25a8

    Affected versions

    v4.3.1
    v4.3.0

    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-2021-3593 | CVE-DB