UBUNTU-CVE-2021-31806

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    UBUNTU-CVE-2021-31806

    Published: 27 May 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-31806
    Aliases:
    USN-4981-1

    Summary:

    Details: An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request processing.

    References: https://ubuntu.com/security/CVE-2021-31806, https://github.com/squid-cache/squid/security/advisories/GHSA-pxwq-f3qr-w2xf, https://ubuntu.com/security/notices/USN-4981-1, https://www.cve.org/CVERecord?id=CVE-2021-31806

    Affected packages

    Package

    Name: squid3

    Purl: pkg:deb/ubuntu/[email protected]+esm6?arch=source&distro=esm-infra/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    3.3.8-1ubuntu16
    3.3.8-1ubuntu17

    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-2021-31806 | CVE-DB