What’s Vulnerable › Vulnerabilities

CVE-2021-3374

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 14.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-04-02 · updated 2026-06-17
• Weakness: CWE-22

Description

Directory traversal in RStudio Shiny Server before 1.5.16 allows attackers to read the application source code, involving an encoded slash.

Affected products

• Rstudio Shiny Server: before 1.5.16 — fixed in 1.5.16

How to fix

Upgrade to a fixed version: Rstudio Shiny Server 1.5.16. Check the vendor advisory for mitigations.

References

• https://blog.rstudio.com/2021/01/13/shiny-server-1-5-16-update/
• https://github.com/colemanjp/shinyserver-directory-traversal-source-code-leak
• https://blog.rstudio.com/2021/01/13/shiny-server-1-5-16-update/
• https://github.com/colemanjp/shinyserver-directory-traversal-source-code-leak

Get alerted when CVE-2021-3374 or the next vulnerability affects your stack