What’s Vulnerable › Vulnerabilities

CVE-2021-28966

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 58.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-07-30 · updated 2026-06-17
• Weakness: CWE-22

Description

In Ruby through 3.0 on Windows, a remote attacker can submit a crafted path when a Web application handles a parameter with TmpDir.

Affected products

• Ruby: before 2.7.3; from 3.0.0 before 3.0.1 — fixed in 2.7.3, 3.0.1

How to fix

Upgrade to a fixed version: Ruby 2.7.3, 3.0.1. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/1131465
• https://security.netapp.com/advisory/ntap-20210902-0004/
• https://hackerone.com/reports/1131465
• https://security.netapp.com/advisory/ntap-20210902-0004/

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