CVE-2018-16851

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    CVE-2018-16851

    Published: 28 Nov 2018Last Modified: 8 Jul 2026

    Summary:

    Details: Samba from version 4.0.0 and before versions 4.7.12, 4.8.7, 4.9.3 is vulnerable to a denial of service. During the processing of an LDAP search before Samba's AD DC returns the LDAP entries to the client, the entries are cached in a single memory object with a maximum size of 256MB. When this size is reached, the Samba process providing the LDAP service will follow the NULL pointer, terminating the process. There is no further vulnerability associated with this issue, merely a denial of service.

    References: http://www.securityfocus.com/bid/106027, https://lists.debian.org/debian-lts-announce/2018/12/msg00005.html, https://security.gentoo.org/glsa/202003-52, https://security.netapp.com/advisory/ntap-20181127-0001/, https://usn.ubuntu.com/3827-1/, https://usn.ubuntu.com/3827-2/, https://www.debian.org/security/2018/dsa-4345, https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16851, https://www.samba.org/samba/security/CVE-2018-16851.html

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- df33344d8eb40221d60c99931690703a11d91bc2
    Fixed -b7d190f89d7674cf58a02486fa9887d393918611

    Affected versions

    samba-4.8.6
    samba-4.8.5
    samba-4.8.3
    samba-4.8.2
    samba-4.8.1
    samba-4.8.0

    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-2018-16851 | CVE-DB