gajim windows installer ships SSLEAY32.DLL/LIBEAY32.DLL from OpenSSL 0.9.8l
The gajim windows installer has two files that seem to be a very old version of OpenSSL: LIBEAY32.dll SSLEAY32.dll
Running strings on them indicates they come from OpenSSL 0.9.8l. Obviously such an old version suffers from plenty of known vulnerabilities, 0.9.8 is out of support since a long time.
However I don't think these files are actually used. None of the other files seem to reference these files, so they may be just a leftover. _ssl.pyd seems to contain a python module from OpenSSL 1.0.1j. While this is much newer, it's still quite outdated and should be replaced with an up-to-date version.