CVE-2021-33564

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    CVE-2021-33564

    Published: 29 May 2021Last Modified: 8 Jul 2026

    Summary:

    Details: An argument injection vulnerability in the Dragonfly gem before 1.4.0 for Ruby allows remote attackers to read and write to arbitrary files via a crafted URL when the verify_url option is disabled. This may lead to code execution. The problem occurs because the generate and process features mishandle use of the ImageMagick convert utility.

    References: https://github.com/markevans/dragonfly/issues/513, https://github.com/markevans/dragonfly/commit/25399297bb457f7fcf8e3f91e85945b255b111b5, https://github.com/markevans/dragonfly/compare/v1.3.0...v1.4.0, https://github.com/mlr0p/CVE-2021-33564, https://raw.githubusercontent.com/projectdiscovery/nuclei-templates/master/cves/2021/CVE-2021-33564.yaml, https://zxsecurity.co.nz/research/argunment-injection-ruby-dragonfly/

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -35e88d14987bf425dcace67f9b100d9a23cae904

    Affected versions

    v1.3.0

    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-2021-33564 | CVE-DB