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    CVE-2023-6683

    A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. The qemu_clipboard_request() function can be reached before vnc_server_cut_text_caps() was called and had the chance to initialize the clipboard peer, leading to a NULL pointer dereference. This could allow a malicious authenticated VNC client to crash QEMU and trigger a denial of service.

    Published:Jan 12, 2024
    Last Modified:Feb 25, 2026
    EPS:Jan 12, 2024
    EPSS Score:0.00073
    CVSS Score:6.5

    Affected Products

    Vendor
    Qemu
    Product
    Qemu
    Vendor
    Redhat
    Product
    Advanced Virtualization
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    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