CVE-2021-33564
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...
- Published
- May 29, 2021
- Updated
- Aug 3, 2024
- Assigning CNA
- mitre
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 99.4%
- Model date
- Oct 17, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
http/cves/2021/CVE-2021-33564.yaml
Nuclei TemplatesDeclared conditions
- network: http($.protocol_keys)
- verification: regex,status($.matchers[*].type)
- CVE-2021-33564Exploit
Argument Injection in Dragonfly Ruby Gem exploit (backup)
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