Is CVE-2021-33564 actively exploited?

Yes. CVE-2021-33564 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-33564 be exploited remotely?

The attack vector of CVE-2021-33564 has not been classified yet.

What is the CVSS score of CVE-2021-33564?

CVE-2021-33564 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-33564

UNKNOWNCISA KEVIN THE WILD

CVE-2021-33564

Published: April 11, 2026

EPSS:93.36%probability of exploitation in 30 daysPercentile:99.8th

Official 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 Source

Technical Analysis

CVE-2021-33564 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-33564 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.