CVE-2021-20277

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    CVE-2021-20277

    Published: 12 May 2021Last Modified: 8 Jul 2026

    Summary:

    Details: A flaw was found in Samba's libldb. Multiple, consecutive leading spaces in an LDAP attribute can lead to an out-of-bounds memory write, leading to a crash of the LDAP server process handling the request. 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-2021-20277.html, https://bugzilla.redhat.com/show_bug.cgi?id=1941402

    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-2021-20277 | CVE-DB