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Vulnerability record · CVE-2021-3374 · published 2 April 2021

CVE-2021-3374: Rstudio shiny server path traversal vulnerability

Rstudio · Shiny Server

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

5.3 CVSS 3.1 Medium EPSS 14% · top 3.5% CWE-22 · Path traversal
5.3CVSS 3.1 base score, v2 5.0
14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-3374), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.