diff --git a/moto/ec2/models.py b/moto/ec2/models.py
index 674e0bddb..4e26f0f65 100755
--- a/moto/ec2/models.py
+++ b/moto/ec2/models.py
@@ -1324,7 +1324,7 @@ class SecurityGroup(TaggedEC2Resource):
         self.name = name
         self.description = description
         self.ingress_rules = []
-        self.egress_rules = [SecurityRule(-1, -1, -1, ['0.0.0.0/0'], [])]
+        self.egress_rules = [SecurityRule(-1, None, None, ['0.0.0.0/0'], [])]
         self.enis = {}
         self.vpc_id = vpc_id
         self.owner_id = "123456789012"
diff --git a/moto/ec2/responses/security_groups.py b/moto/ec2/responses/security_groups.py
index 9118c01b3..0009ff131 100644
--- a/moto/ec2/responses/security_groups.py
+++ b/moto/ec2/responses/security_groups.py
@@ -179,8 +179,12 @@ DESCRIBE_SECURITY_GROUPS_RESPONSE = """<DescribeSecurityGroupsResponse xmlns="ht
                {% for rule in group.egress_rules %}
                     <item>
                        <ipProtocol>{{ rule.ip_protocol }}</ipProtocol>
+                       {% if rule.from_port %}
                        <fromPort>{{ rule.from_port }}</fromPort>
+                       {% endif %}
+                       {% if rule.to_port %}
                        <toPort>{{ rule.to_port }}</toPort>
+                       {% endif %}
                        <groups>
                           {% for source_group in rule.source_groups %}
                               <item>