Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2021-33575

32
FAUCET Score

CVE-2021-33575 is a critical remote code execution (RCE) vulnerability affecting the Pixar ruby-jss gem prior to version 1.6.0. This flaw stems from the Plist gem's use of Marshal.load during XML document processing, allowing attackers to execute arbitrary code. With a CVSS score of 9.8, it presents a severe risk due to its network-based attack vector, low attack complexity, and complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation, no public exploit code (Metasploit, Nuclei, ExploitDB), or KEV listing, the vulnerability has garnered significant community discussion, indicating awareness among security researchers.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.6.0CPE matchmatch criteria
cpe:2.3:a:pixar:ruby-jss:*:*:*:*:*:ruby:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.60%
Probability of exploitation in next 30 days
EPSS Percentile
83.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0260 is in the 74th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rubygemspatch availablevia ghsa
Product: ruby-jssFixed in: 1.6.0

Vendor Advisories (1)

rubygemsGHSA-vmfh-c547-v45hcritical

Remote code execution in ruby-jss

Oct 6, 2021

References

github.com / patsplat/plist/tree/ce8f9ae42a114f603ea200c955e420782bffc4ad
Third Party Advisory
github.com / PixarAnimationStudios/ruby-jss/blob/e6d48dd8c77f9275c76787d60d3472615fcd9b77/CHANGES.md
Release NotesThird Party Advisory