UBUNTU-CVE-2021-23017

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    UBUNTU-CVE-2021-23017

    Published: 25 May 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-23017

    Summary:

    Details: A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact.

    References: https://ubuntu.com/security/CVE-2021-23017, https://www.x41-dsec.de/lab/advisories/x41-2021-002-nginx-resolver-copy/, https://ubuntu.com/security/notices/USN-4967-1, https://ubuntu.com/security/notices/USN-4967-2, https://www.cve.org/CVERecord?id=CVE-2021-23017

    Affected packages

    Package

    Name: nginx

    Purl: pkg:deb/ubuntu/[email protected]+esm2?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.4.6-1ubuntu3.9+esm2

    Affected versions

    1.4.1-3ubuntu1
    1.4.3-2ubuntu1
    1.4.4-1ubuntu1
    1.4.4-2ubuntu1
    1.4.4-4ubuntu1
    1.4.5-1ubuntu1
    1.4.6-1ubuntu2
    1.4.6-1ubuntu3
    1.4.6-1ubuntu3.1
    1.4.6-1ubuntu3.2
    1.4.6-1ubuntu3.3
    1.4.6-1ubuntu3.4
    1.4.6-1ubuntu3.5
    1.4.6-1ubuntu3.6
    1.4.6-1ubuntu3.7
    1.4.6-1ubuntu3.8
    1.4.6-1ubuntu3.9
    1.4.6-1ubuntu3.9+esm1

    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
    UBUNTU-CVE-2021-23017 | CVE-DB