CVE-2020-27840

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    CVE-2020-27840

    Published: 12 May 2021Last Modified: 8 Jul 2026

    Summary:

    Details: A flaw was found in samba. Spaces used in a string around a domain name (DN), while supposed to be ignored, can cause invalid DN strings with spaces to instead write a zero-byte into out-of-bounds memory, resulting in a crash. The highest threat from this vulnerability is to system availability.

    References: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLZ74IF2N75VQSIHBL4B3P5WKWQCXSRY/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X5J3B6PN5XMXF3OHYBNHDKZ3XFSUGY4L/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZXP3ONIY6MB4C5LDZV4YL5KJCES3UX24/, https://lists.debian.org/debian-lts-announce/2021/03/msg00036.html, https://security.gentoo.org/glsa/202105-22, https://security.netapp.com/advisory/ntap-20210326-0007/, https://www.debian.org/security/2021/dsa-4884, https://www.samba.org/samba/security/CVE-2020-27840.html, https://bugzilla.redhat.com/show_bug.cgi?id=1941400

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- df33344d8eb40221d60c99931690703a11d91bc2
    Fixed -bb2f64babf1a2bfb780d0325e859f796d0ce1647

    Affected versions

    samba-4.13.5
    samba-4.13.4
    samba-4.13.3
    samba-4.13.2
    samba-4.13.0

    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-2020-27840 | CVE-DB