A Directory Traversal issue was discovered in Sonatype Nexus Repository Manager 2.x before 2.14.19. A user that requests a crafted path can traverse up the file system to get access to content on disk (that the user running nxrm also has access to).
Sonatype Nexus Repository Manager before 3.17.0 has a weak default of giving any unauthenticated user read permissions on the repository files and images.