Directory traversal vulnerability in 3S CODESYS Gateway-Server before 2.3.9.27 allows remote attackers to execute arbitrary code via vectors involving a crafted pathname.
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.