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    CVE-2018-20024

    LibVNC before commit 4a21bbd097ef7c44bb000c3bd0907f96a10e4ce7 contains null pointer dereference in VNC client code that can result DoS.

    Published:Dec 19, 2018
    Last Modified:Nov 21, 2024
    EPS:Dec 19, 2018
    EPSS Score:0.02823
    CVSS Score:7.5

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Libvnc Project
    Product
    Libvncserver

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
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    References

    https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-034-libvnc-null-pointer-dereference/
    https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html
    https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
    https://lists.debian.org/debian-lts-announce/2019/11/msg00033.html
    https://security.gentoo.org/glsa/201908-05
    https://security.gentoo.org/glsa/202006-06
    https://usn.ubuntu.com/3877-1/
    https://usn.ubuntu.com/4547-1/
    https://usn.ubuntu.com/4547-2/
    https://usn.ubuntu.com/4587-1/
    https://www.debian.org/security/2019/dsa-4383
    https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-034-libvnc-null-pointer-dereference/
    https://lists.debian.org/debian-lts-announce/2018/12/msg00017.html
    https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
    https://lists.debian.org/debian-lts-announce/2019/11/msg00033.html
    https://security.gentoo.org/glsa/201908-05
    https://security.gentoo.org/glsa/202006-06
    https://usn.ubuntu.com/3877-1/
    https://usn.ubuntu.com/4547-1/
    https://usn.ubuntu.com/4547-2/
    https://usn.ubuntu.com/4587-1/
    https://www.debian.org/security/2019/dsa-4383

    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