UBUNTU-CVE-2021-28651

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    UBUNTU-CVE-2021-28651

    Published: 27 May 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-28651

    Summary:

    Details: An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of memory consumption.

    References: https://ubuntu.com/security/CVE-2021-28651, https://github.com/squid-cache/squid/security/advisories/GHSA-ch36-9jhx-phm4, https://ubuntu.com/security/notices/USN-4981-1, https://www.cve.org/CVERecord?id=CVE-2021-28651, https://ubuntu.com/security/notices/USN-6857-1

    Affected packages

    Package

    Name: squid3

    Purl: pkg:deb/ubuntu/[email protected]+esm3?arch=source&distro=esm-infra/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.5.12-1ubuntu7.16+esm3

    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-2021-28651 | CVE-DB