Solution : https://service.sap.com/sap/support/notes/1501448 (SAP Service marketplace login required)
Key words : 
/swdc  -> software downloads -> software download center  -> sap software donwload center -> support packages & patches -> a-, /swdc  >  download  >  support packages & patches >  search, sca -> search term = cu base web dynprocubasewdext, sca -> search term = web dynpro runtime extcubasejava, sca -> search term = cu base wd extensions, sca -> search term = cu base javacubasewd, sca -> search term = web dynpro applicationswdruntime, sca -> search term = web dynpro runtimewdruntimeext, sca -> search term = bi webdynpro alvframework, sca -> search term = java frameworkwdapps
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