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CVE-2021-33564

CRITICAL
9.8
CVSS Score
Published: May 29, 2021 at 01:19 PM UTC
Updated: June 17, 2026 at 03:54 AM UTC
1 product affected across 1 vendorDragonfly

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Severity
CRITICAL9.8
Exploit prediction
EPSS 72%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Dragonfly· Dragonfly Projectrubygems
95%
v < 1.4.0
Affected range stops below 1.4.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (6)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/markevans/dragonfly/commit/25399297bb457f7fcf8e3f91e85945b255b111b5
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/markevans/dragonfly/compare/v1.3.0...v1.4.0
x_refsource_MISCIssue TrackingThird Party Advisory
Source: [email protected]
https://github.com/markevans/dragonfly/issues/513
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://github.com/mlr0p/CVE-2021-33564
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://raw.githubusercontent.com/projectdiscovery/nuclei-templates/master/cves/2021/CVE-2021-33564.yaml
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://zxsecurity.co.nz/research/argunment-injection-ruby-dragonfly/

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-88

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