CVE-2020-27637

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-01-12 · updated 2026-06-17
Weakness: CWE-22

Description

The R programming language’s default package manager CRAN is affected by a path traversal vulnerability that can lead to server compromise. This vulnerability affects packages installed via the R CMD install cli command or the install.packages() function from the interpreter. Update to version 4.0.3

Affected products

R-Project Cran: before 4.0.3 — fixed in 4.0.3

How to fix

Upgrade to a fixed version: R-Project Cran 4.0.3. Check the vendor advisory for mitigations.

References

https://labs.bishopfox.com/advisories/cran-version-4.0.2
https://security.gentoo.org/glsa/202401-07
https://www.r-project.org/foundation/
https://labs.bishopfox.com/advisories/cran-version-4.0.2
https://security.gentoo.org/glsa/202401-07
https://www.r-project.org/foundation/

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