UBUNTU-CVE-2021-3672

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    UBUNTU-CVE-2021-3672

    Published: 10 Aug 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-3672

    Summary:

    Details: A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of wrong hostnames which might potentially lead to Domain Hijacking. The highest threat from this vulnerability is to confidentiality and integrity as well as system availability.

    References: https://ubuntu.com/security/CVE-2021-3672, https://c-ares.haxx.se/adv_20210810.html, https://ubuntu.com/security/notices/USN-5034-1, https://ubuntu.com/security/notices/USN-5034-2, https://www.cve.org/CVERecord?id=CVE-2021-3672

    Affected packages

    Package

    Name: c-ares

    Purl: pkg:deb/ubuntu/[email protected]+esm1?arch=source&distro=esm-infra/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.10.0-3ubuntu0.2+esm1

    Affected versions

    1.10.0-2
    1.10.0-3
    1.10.0-3ubuntu0.1
    1.10.0-3ubuntu0.2

    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-2021-3672 | CVE-DB