this test is using the contents of /synohdpack/synohdpack.version to determine the DSM version. however the version numbers in this file are from the Synology HDD/SDD Drive Database and they are not necessarily in line with the actual DSM version number, especially after installing an update manually. the actual version number is in the file /etc(.defaults)/VERSION but that one is not included in the nginx setup.
So far we noticed that the patch level version is not present in /synohdpack/synohdpack.version, that is why every advisory concerning a fix via a patch version has 2 corresponding VTs, one for reliable checks and one for unreliable checks, for example 1.3.6.1.4.1.25623.1.0.170271 and 1.3.6.1.4.1.25623.1.0.170504.
We have no information until now that major version, minor version or build number were wrong in the /synohdpack/synohdpack.version.