fix: [vulnerability_lookup] Avoiding KeyError exceptions on some fields

misp_modules/modules/expansion/vulnerability_lookup.py

@@ -152,7 +152,7 @@ def _parse_csaf_description(self, lookup_result: dict) -> str:
         for field, relation in self.mapping.csaf_mapping().items():
             misp_object.add_attribute(relation, tracking[field])
         misp_object.add_attribute('summary', description['title'])
-        for reference in description['references']:
+        for reference in description.get('references', []):
             misp_object.add_attribute('references', reference['url'])
         misp_object.add_attribute('credit', description['publisher']['name'])
         misp_object.add_reference(self.misp_attribute.uuid, 'describes')    
@@ -183,7 +183,7 @@ def _parse_csaf_description(self, lookup_result: dict) -> str:
 
     def _parse_cve_description(self, lookup_result: dict) -> str:
         misp_object = MISPObject('vulnerability')
-        cveMetaData = lookup_result['cveMetaData']
+        cveMetaData = lookup_result['cveMetadata']
         for field, relation in self.mapping.cve_mapping().items():
             misp_object.add_attribute(relation, cveMetaData[field])
         for reference in lookup_result['containers']['cna']['references']:
@@ -267,9 +267,8 @@ def _parse_standard_description(self, lookup_result: dict) -> str:
         misp_object = MISPObject('vulnerability')
         for field, relation in self.mapping.standard_mapping().items():
             misp_object.add_attribute(relation, lookup_result[field])
-        misp_object.add_attribute(
-            'cvss-string', lookup_result['severity']['score']
-        )
+        for cvss in lookup_result.get('severity', []):
+            misp_object.add_attribute('cvss-string', cvss['score'])
         for reference in lookup_result['references']:
             misp_object.add_attribute('references', reference['url'])
         misp_object.add_reference(self.misp_attribute.uuid, 'related-to')