[client] Fix vulnerability backward compat (#537)

Author: SamuelHassine

pycti/entities/opencti_vulnerability.py

@@ -370,23 +370,28 @@ def import_from_stix2(self, **kwargs):
         update = kwargs.get("update", False)
 
         if stix_object is not None:
-            # Retro compatibility
+            # Backward compatibility
             if "x_opencti_base_score" in stix_object:
                 stix_object["x_opencti_cvss_base_score"] = stix_object[
                     "x_opencti_base_score"
                 ]
+            if "x_opencti_base_severity" in stix_object:
                 stix_object["x_opencti_cvss_base_severity"] = stix_object[
                     "x_opencti_base_severity"
                 ]
+            if "x_opencti_attack_vector" in stix_object:
                 stix_object["x_opencti_cvss_attack_vector"] = stix_object[
                     "x_opencti_attack_vector"
                 ]
+            if "x_opencti_integrity_impact" in stix_object:
                 stix_object["x_opencti_cvss_integrity_impact"] = stix_object[
                     "x_opencti_integrity_impact"
                 ]
+            if "x_opencti_availability_impact" in stix_object:
                 stix_object["x_opencti_cvss_availability_impact"] = stix_object[
                     "x_opencti_availability_impact"
                 ]
+            if "x_opencti_confidentiality_impact" in stix_object:
                 stix_object["x_opencti_cvss_confidentiality_impact"] = stix_object[
                     "x_opencti_confidentiality_impact"
                 ]