CVE-2021-3374
Directory traversal in RStudio Shiny Server before 1.5.16 allows attackers to read the application source code, involving an encoded slash.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 14.4%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
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
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 14.42% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- rstudio/shiny server
- Source
- cve@mitre.org
EPSS 14.4% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://blog.rstudio.com/2021/01/13/shiny-server-1-5-16-update/Vendor Advisory
- https://github.com/colemanjp/shinyserver-directory-traversal-source-code-leakExploit, Third 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-leakExploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.