CVE-2021-28651

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    CVE-2021-28651

    Published: 27 May 2021Last Modified: 8 Jul 2026

    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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/, http://seclists.org/fulldisclosure/2023/Oct/14, http://www.openwall.com/lists/oss-security/2023/10/11/3, https://lists.debian.org/debian-lts-announce/2021/06/msg00014.html, https://security.netapp.com/advisory/ntap-20210716-0007/, https://www.debian.org/security/2021/dsa-4924, https://bugs.squid-cache.org/show_bug.cgi?id=5104, https://github.com/squid-cache/squid/security/advisories/GHSA-ch36-9jhx-phm4

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -648729b05673c6166c5d91c6ee4cda30cc164839

    Affected versions

    SQUID_4_14

    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
    CVE-2021-28651 | CVE-DB