USN-4976-1

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    USN-4976-1

    Published: 2 Jun 2021Last Modified: 10 Feb 2026

    Summary: dnsmasq vulnerability

    Details: Petr Mensik discovered that Dnsmasq incorrectly randomized source ports in certain configurations. A remote attacker could possibly use this issue to facilitate DNS cache poisoning attacks.

    References: https://ubuntu.com/security/notices/USN-4976-1, https://ubuntu.com/security/CVE-2021-3448

    Affected packages

    Package

    Name: dnsmasq

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.79-1ubuntu0.4

    Affected versions

    2.78-1

    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
    USN-4976-1 | CVE-DB