CVE-2023-4236

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    CVE-2023-4236

    Published: 20 Sept 2023Last Modified: 7 Aug 2026

    Summary:

    Details: A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load. This issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.

    References: http://www.openwall.com/lists/oss-security/2023/09/20/2, https://kb.isc.org/docs/cve-2023-4236, https://lists.fedoraproject.org/archives/list/[email protected]/message/VSK5V4W4OHPM3JTJGWAQD6CZW7SFD75B/, https://security.netapp.com/advisory/ntap-20231013-0004/, https://www.debian.org/security/2023/dsa-5504, https://lists.fedoraproject.org/archives/list/[email protected]/message/IPJLLTJCSDJJII7IIZPLTBQNWP7MZH7F/, https://lists.fedoraproject.org/archives/list/[email protected]/message/U35OARLQCPMVCBBPHWBXY5M6XJLD2TZ5/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 8db45afa1affcb823e68afdeddedf93e136f5d3e
    Fixed -1f8de2f0aa6a47e299fbd8e66921fbcb4c5f64dc

    Affected versions

    v9.18.0

    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-2023-4236 | CVE-DB