CVE-2021-33564
CVE-2021-33564 is a critical-severity vulnerability in Dragonfly Project Dragonfly with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 72% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-88.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 6.8
- EPSS exploit prediction: 72% (99th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-88
- Affected product: Dragonfly Project Dragonfly
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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 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.
- How severe is CVE-2021-33564?
- CVE-2021-33564 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-33564 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 72% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-33564?
- CVE-2021-33564 affects Dragonfly Project Dragonfly. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-33564?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2021-33564 published?
- CVE-2021-33564 was published on 2021-05-29 and last updated on 2026-06-17.
References
- https://github.com/markevans/dragonfly/commit/25399297bb457f7fcf8e3f91e85945b255b111b5
- https://github.com/markevans/dragonfly/compare/v1.3.0...v1.4.0
- https://github.com/markevans/dragonfly/issues/513
- 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 products (1)
- cpe:2.3:a:dragonfly_project:dragonfly:*:*:*:*:*:ruby:*:*
More vulnerabilities in Dragonfly Project Dragonfly
- CVE-2021-33473 — Critical (CVSS 9.1): An argument injection vulnerability in Dragonfly Ruby Gem v1.3.0 allows attackers to read and write arbitrary files…
All CVEs affecting Dragonfly Project Dragonfly →
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