PatchTheCVECVE-2021-33575: The Pixar ruby-jss gem before 1.6.0 allows remote attackers to execute arbitrary code because of the Plist gem
CVE-2021-33575 is a critical-severity flaw (CVSS 9.8) affecting ruby-jss. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 2.6% (top 15%) |
| CISA exploited list | No |
| Published | 2021-05-25 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-33575?
ruby-jss: upgrade to 1.6.0. Exact commands for each OS are on this page.
Is CVE-2021-33575 being exploited?
CVE-2021-33575 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-33575 affect?
CVE-2021-33575 affects ruby-jss. Severity is critical (CVSS 9.8). 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.
How urgent is CVE-2021-33575?
Priority 61/100. Critical severity; Remotely exploitable, no login, no user action