diff --git a/cyclonedx/model/__init__.py b/cyclonedx/model/__init__.py
index 925c2a90..ff0abc77 100644
--- a/cyclonedx/model/__init__.py
+++ b/cyclonedx/model/__init__.py
@@ -835,11 +835,13 @@ def __init__(
         url: XsUri,
         comment: Optional[str] = None,
         hashes: Optional[Iterable[HashType]] = None,
+        properties: Optional[Iterable['Property']] = None,
     ) -> None:
         self.url = url
         self.comment = comment
         self.type = type
         self.hashes = hashes or []
+        self.properties = properties or []
 
     @property
     @serializable.xml_sequence(1)
@@ -909,10 +911,27 @@ def hashes(self) -> 'SortedSet[HashType]':
     def hashes(self, hashes: Iterable[HashType]) -> None:
         self._hashes = SortedSet(hashes)
 
+    @property
+    @serializable.view(SchemaVersion1Dot7)
+    @serializable.xml_array(serializable.XmlArraySerializationType.NESTED, 'property')
+    def properties(self) -> 'SortedSet[Property]':
+        """
+        Provides the ability to document properties in a key/value store. This provides flexibility to include data not
+        officially supported in the standard without having to use additional namespaces or create extensions.
+
+        Return:
+            Set of `Property`
+        """
+        return self._properties
+
+    @properties.setter
+    def properties(self, properties: Iterable['Property']) -> None:
+        self._properties = SortedSet(properties)
+
     def __comparable_tuple(self) -> _ComparableTuple:
         return _ComparableTuple((
             self._type, self._url, self._comment,
-            _ComparableTuple(self._hashes)
+            _ComparableTuple(self._hashes), _ComparableTuple(self.properties),
         ))
 
     def __eq__(self, other: object) -> bool:
diff --git a/tests/_data/models.py b/tests/_data/models.py
index 8d3a089d..4de64fcf 100644
--- a/tests/_data/models.py
+++ b/tests/_data/models.py
@@ -587,7 +587,7 @@ def get_bom_just_complete_metadata() -> Bom:
 
 def get_bom_with_external_references() -> Bom:
     bom = _make_bom(external_references=[
-        get_external_reference_1(), get_external_reference_2()
+        get_external_reference_1(), get_external_reference_2(), get_external_reference_with_properties()
     ])
     return bom
 
@@ -895,6 +895,17 @@ def get_external_reference_2() -> ExternalReference:
     )
 
 
+def get_external_reference_with_properties() -> ExternalReference:
+    return ExternalReference(
+        type=ExternalReferenceType.VCS,
+        url=XsUri('https://cyclonedx.org'),
+        properties=[
+            Property(name='property_1', value='value_1'),
+            Property(name='property_2', value='value_2')
+        ]
+    )
+
+
 def get_issue_1() -> IssueType:
     return IssueType(
         type=IssueClassification.SECURITY, id='CVE-2021-44228', name='Apache Log3Shell',
diff --git a/tests/_data/snapshots/get_bom_with_external_references-1.1.xml.bin b/tests/_data/snapshots/get_bom_with_external_references-1.1.xml.bin
index 0a260e81..b7b31df0 100644
--- a/tests/_data/snapshots/get_bom_with_external_references-1.1.xml.bin
+++ b/tests/_data/snapshots/get_bom_with_external_references-1.1.xml.bin
@@ -6,6 +6,9 @@
       <url>https://cyclonedx.org</url>
       <comment>No comment</comment>
     </reference>
+    <reference type="vcs">
+      <url>https://cyclonedx.org</url>
+    </reference>
     <reference type="website">
       <url>https://cyclonedx.org</url>
     </reference>
diff --git a/tests/_data/snapshots/get_bom_with_external_references-1.2.json.bin b/tests/_data/snapshots/get_bom_with_external_references-1.2.json.bin
index b108f640..0e507a44 100644
--- a/tests/_data/snapshots/get_bom_with_external_references-1.2.json.bin
+++ b/tests/_data/snapshots/get_bom_with_external_references-1.2.json.bin
@@ -5,6 +5,10 @@
       "type": "distribution",
       "url": "https://cyclonedx.org"
     },
+    {
+      "type": "vcs",
+      "url": "https://cyclonedx.org"
+    },
     {
       "type": "website",
       "url": "https://cyclonedx.org"
diff --git a/tests/_data/snapshots/get_bom_with_external_references-1.2.xml.bin b/tests/_data/snapshots/get_bom_with_external_references-1.2.xml.bin
index 44a8e0a5..4fba839e 100644
--- a/tests/_data/snapshots/get_bom_with_external_references-1.2.xml.bin
+++ b/tests/_data/snapshots/get_bom_with_external_references-1.2.xml.bin
@@ -8,6 +8,9 @@
       <url>https://cyclonedx.org</url>
       <comment>No comment</comment>
     </reference>
+    <reference type="vcs">
+      <url>https://cyclonedx.org</url>
+    </reference>
     <reference type="website">
       <url>https://cyclonedx.org</url>
     </reference>
diff --git a/tests/_data/snapshots/get_bom_with_external_references-1.3.json.bin b/tests/_data/snapshots/get_bom_with_external_references-1.3.json.bin
index 19fcd07f..3e793c50 100644
--- a/tests/_data/snapshots/get_bom_with_external_references-1.3.json.bin
+++ b/tests/_data/snapshots/get_bom_with_external_references-1.3.json.bin
@@ -11,6 +11,10 @@
       "type": "distribution",
       "url": "https://cyclonedx.org"
     },
+    {
+      "type": "vcs",
+      "url": "https://cyclonedx.org"
+    },
     {
       "type": "website",
       "url": "https://cyclonedx.org"
diff --git a/tests/_data/snapshots/get_bom_with_external_references-1.3.xml.bin b/tests/_data/snapshots/get_bom_with_external_references-1.3.xml.bin
index 0ae18fba..13a9e149 100644
--- a/tests/_data/snapshots/get_bom_with_external_references-1.3.xml.bin
+++ b/tests/_data/snapshots/get_bom_with_external_references-1.3.xml.bin
@@ -11,6 +11,9 @@
         <hash alg="SHA-256">806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b</hash>
       </hashes>
     </reference>
+    <reference type="vcs">
+      <url>https://cyclonedx.org</url>
+    </reference>
     <reference type="website">
       <url>https://cyclonedx.org</url>
     </reference>
diff --git a/tests/_data/snapshots/get_bom_with_external_references-1.4.json.bin b/tests/_data/snapshots/get_bom_with_external_references-1.4.json.bin
index e90c3ea2..43fbfa6d 100644
--- a/tests/_data/snapshots/get_bom_with_external_references-1.4.json.bin
+++ b/tests/_data/snapshots/get_bom_with_external_references-1.4.json.bin
@@ -11,6 +11,10 @@
       "type": "distribution",
       "url": "https://cyclonedx.org"
     },
+    {
+      "type": "vcs",
+      "url": "https://cyclonedx.org"
+    },
     {
       "type": "website",
       "url": "https://cyclonedx.org"
diff --git a/tests/_data/snapshots/get_bom_with_external_references-1.4.xml.bin b/tests/_data/snapshots/get_bom_with_external_references-1.4.xml.bin
index f64b1c7a..7889bb9d 100644
--- a/tests/_data/snapshots/get_bom_with_external_references-1.4.xml.bin
+++ b/tests/_data/snapshots/get_bom_with_external_references-1.4.xml.bin
@@ -11,6 +11,9 @@
         <hash alg="SHA-256">806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b</hash>
       </hashes>
     </reference>
+    <reference type="vcs">
+      <url>https://cyclonedx.org</url>
+    </reference>
     <reference type="website">
       <url>https://cyclonedx.org</url>
     </reference>
diff --git a/tests/_data/snapshots/get_bom_with_external_references-1.5.json.bin b/tests/_data/snapshots/get_bom_with_external_references-1.5.json.bin
index 55238588..52a6c19d 100644
--- a/tests/_data/snapshots/get_bom_with_external_references-1.5.json.bin
+++ b/tests/_data/snapshots/get_bom_with_external_references-1.5.json.bin
@@ -11,6 +11,10 @@
       "type": "distribution",
       "url": "https://cyclonedx.org"
     },
+    {
+      "type": "vcs",
+      "url": "https://cyclonedx.org"
+    },
     {
       "type": "website",
       "url": "https://cyclonedx.org"
diff --git a/tests/_data/snapshots/get_bom_with_external_references-1.5.xml.bin b/tests/_data/snapshots/get_bom_with_external_references-1.5.xml.bin
index 411ab39a..1a6c87b1 100644
--- a/tests/_data/snapshots/get_bom_with_external_references-1.5.xml.bin
+++ b/tests/_data/snapshots/get_bom_with_external_references-1.5.xml.bin
@@ -11,6 +11,9 @@
         <hash alg="SHA-256">806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b</hash>
       </hashes>
     </reference>
+    <reference type="vcs">
+      <url>https://cyclonedx.org</url>
+    </reference>
     <reference type="website">
       <url>https://cyclonedx.org</url>
     </reference>
diff --git a/tests/_data/snapshots/get_bom_with_external_references-1.6.json.bin b/tests/_data/snapshots/get_bom_with_external_references-1.6.json.bin
index 82c9bc40..050afd04 100644
--- a/tests/_data/snapshots/get_bom_with_external_references-1.6.json.bin
+++ b/tests/_data/snapshots/get_bom_with_external_references-1.6.json.bin
@@ -11,6 +11,10 @@
       "type": "distribution",
       "url": "https://cyclonedx.org"
     },
+    {
+      "type": "vcs",
+      "url": "https://cyclonedx.org"
+    },
     {
       "type": "website",
       "url": "https://cyclonedx.org"
diff --git a/tests/_data/snapshots/get_bom_with_external_references-1.6.xml.bin b/tests/_data/snapshots/get_bom_with_external_references-1.6.xml.bin
index 7dee398e..6216a6d3 100644
--- a/tests/_data/snapshots/get_bom_with_external_references-1.6.xml.bin
+++ b/tests/_data/snapshots/get_bom_with_external_references-1.6.xml.bin
@@ -11,6 +11,9 @@
         <hash alg="SHA-256">806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b</hash>
       </hashes>
     </reference>
+    <reference type="vcs">
+      <url>https://cyclonedx.org</url>
+    </reference>
     <reference type="website">
       <url>https://cyclonedx.org</url>
     </reference>
diff --git a/tests/_data/snapshots/get_bom_with_external_references-1.7.json.bin b/tests/_data/snapshots/get_bom_with_external_references-1.7.json.bin
index 01744db6..ebeb8024 100644
--- a/tests/_data/snapshots/get_bom_with_external_references-1.7.json.bin
+++ b/tests/_data/snapshots/get_bom_with_external_references-1.7.json.bin
@@ -11,6 +11,20 @@
       "type": "distribution",
       "url": "https://cyclonedx.org"
     },
+    {
+      "properties": [
+        {
+          "name": "property_1",
+          "value": "value_1"
+        },
+        {
+          "name": "property_2",
+          "value": "value_2"
+        }
+      ],
+      "type": "vcs",
+      "url": "https://cyclonedx.org"
+    },
     {
       "type": "website",
       "url": "https://cyclonedx.org"
diff --git a/tests/_data/snapshots/get_bom_with_external_references-1.7.xml.bin b/tests/_data/snapshots/get_bom_with_external_references-1.7.xml.bin
index 02af4c30..dcf64c05 100644
--- a/tests/_data/snapshots/get_bom_with_external_references-1.7.xml.bin
+++ b/tests/_data/snapshots/get_bom_with_external_references-1.7.xml.bin
@@ -11,6 +11,13 @@
         <hash alg="SHA-256">806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b</hash>
       </hashes>
     </reference>
+    <reference type="vcs">
+      <url>https://cyclonedx.org</url>
+      <properties>
+        <property name="property_1">value_1</property>
+        <property name="property_2">value_2</property>
+      </properties>
+    </reference>
     <reference type="website">
       <url>https://cyclonedx.org</url>
     </reference>
diff --git a/tests/test_model_component.py b/tests/test_model_component.py
index 9c47fe02..44f59a12 100644
--- a/tests/test_model_component.py
+++ b/tests/test_model_component.py
@@ -132,16 +132,24 @@ def test_multiple_basic_components(self) -> None:
 
     def test_external_references(self) -> None:
         c1 = Component(name='test-component')
+        properties = [
+            Property(name='property_1', value='value_1'),
+            Property(name='property_2', value='value_2')
+        ]
         c1.external_references.add(ExternalReference(
             type=ExternalReferenceType.OTHER,
             url=XsUri('https://cyclonedx.org'),
-            comment='No comment'
+            comment='No comment',
+            properties=properties
         ))
         self.assertEqual(c1.name, 'test-component')
         self.assertIsNone(c1.version)
         self.assertEqual(c1.type, ComponentType.LIBRARY)
         self.assertEqual(len(c1.external_references), 1)
         self.assertEqual(len(c1.hashes), 0)
+        self.assertIsNotNone(c1.external_references[0].properties)
+        self.assertIn(properties[0], c1.external_references[0].properties)
+        self.assertIn(properties[1], c1.external_references[0].properties)
 
         c2 = Component(name='test2-component')
         self.assertEqual(c2.name, 'test2-component')
@@ -163,13 +171,15 @@ def test_component_equal_1(self) -> None:
         c1.external_references.add(ExternalReference(
             type=ExternalReferenceType.OTHER,
             url=XsUri('https://cyclonedx.org'),
-            comment='No comment'
+            comment='No comment',
+            properties=[Property(name='property_1', value='value_1')]
         ))
         c2 = Component(name='test-component')
         c2.external_references.add(ExternalReference(
             type=ExternalReferenceType.OTHER,
             url=XsUri('https://cyclonedx.org'),
-            comment='No comment'
+            comment='No comment',
+            properties=[Property(name='property_1', value='value_1')]
         ))
         self.assertEqual(c1, c2)