Dragonfly contains remote code execution vulnerability

CRITICAL 9.8CVE-2021-33564 · GHSA-j858-xp5v-f8xx · Published 29/05/2021 · updated 17/06/2026

Package	Affected versions	Patched versions
dragonfly RubyGems	`< 1.4.0`	`1.4.0`
dragonfly dragonfly_project	`< 1.4.0`	`1.4.0`

Description

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.

NVD description

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

nvd.nist.gov/vuln/detail/CVE-2021-33564 · ADVISORY
markevans/dragonfly · WEB
markevans/dragonfly commit 2539929 · WEB
GitHub Advisory GHSA-j858-xp5v-f8xx · ADVISORY
markevans/dragonfly · WEB
mlr0p/CVE-2021-33564 · WEB
rubysec/ruby-advisory-db · WEB
raw.githubusercontent.com/projectdiscovery/nuclei-templates/master/cves/2021/CVE-2021-33564.yaml · WEB
zxsecurity.co.nz/research/argunment-injection-ruby-dragonfly · WEB
zxsecurity.co.nz/research/argunment-injection-ruby-dragonfly · Exploit

Running one of these products? Scan your site to see whether it exposes a vulnerable version.

Scan my site free