CVE-2018-20023

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    CVE-2018-20023

    Published: 19 Dec 2018Last Modified: 7 Aug 2026

    Summary:

    Details: LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR

    References: https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html, https://usn.ubuntu.com/4547-1/, https://usn.ubuntu.com/4587-1/, https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-033-libvnc-memory-leak/, https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html, https://security.gentoo.org/glsa/201908-05, https://usn.ubuntu.com/3877-1/, https://www.debian.org/security/2019/dsa-4383

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -0a70095271d845d16a3ed17354841b01f33963ad

    Affected versions

    LibVNCServer-0.9.11
    LibVNCServer-0.9.10
    LibVNCServer-0.9.9
    LibVNCServer-0.9.8

    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