USN-5104-1

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    USN-5104-1

    Published: 5 Oct 2021Last Modified: 27 Apr 2026

    Summary: squid, squid3 vulnerability

    Details: Lyu discovered that Squid incorrectly handled WCCP protocol data. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or possibly obtain sensitive information.

    References: https://ubuntu.com/security/notices/USN-5104-1, https://ubuntu.com/security/CVE-2021-28116

    Affected packages

    Package

    Name: squid3

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.5.27-1ubuntu1.12

    Affected versions

    3.5.23-5ubuntu1
    3.5.23-5ubuntu2
    3.5.27-1ubuntu1
    3.5.27-1ubuntu1.1
    3.5.27-1ubuntu1.2
    3.5.27-1ubuntu1.3
    3.5.27-1ubuntu1.4
    3.5.27-1ubuntu1.5
    3.5.27-1ubuntu1.6
    3.5.27-1ubuntu1.7
    3.5.27-1ubuntu1.8
    3.5.27-1ubuntu1.9
    3.5.27-1ubuntu1.10
    3.5.27-1ubuntu1.11

    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-5104-1 | CVE-DB