What is CVE-2021-33575?

CVE-2021-33575 is a critical-severity vulnerability in Pixar Ruby-Jss. CVSS score: 9.8/10. Published 2021-05-25.

How severe is CVE-2021-33575?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Pixar Ruby-Jss

CVE-2021-33575

The Pixar ruby-jss gem before 1.6.0 allows remote attackers to execute arbitrary code because of the Plist gem's documented behavior of using Marshal.load during XML document processing.

Published 2021-05-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.026 (84.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: 0.000

Affected products

Pixar Ruby-Jss

References

github.com/PixarAnimationStudios/ruby-jss/blob/e6d48dd8c77f9275c76787d60d347261… (Third Party Advisory, Release Notes)
github.com/patsplat/plist/tree/ce8f9ae42a114f603ea200c955e420782bffc4ad (Third Party Advisory)

Frequently asked questions

What is CVE-2021-33575?: CVE-2021-33575 is a critical-severity vulnerability in Pixar Ruby-Jss. CVSS score: 9.8/10. Published 2021-05-25.
How severe is CVE-2021-33575?: Critical severity. CVSS v3 base score is 9.8 out of 10.