diff --git a/2021/27xxx/CVE-2021-27853.json b/2021/27xxx/CVE-2021-27853.json
index bb9c71025c4..e16873d7e93 100644
--- a/2021/27xxx/CVE-2021-27853.json
+++ b/2021/27xxx/CVE-2021-27853.json
@@ -4,15 +4,117 @@
     "data_version": "4.0",
     "CVE_data_meta": {
         "ID": "CVE-2021-27853",
-        "ASSIGNER": "cve@mitre.org",
-        "STATE": "RESERVED"
+        "ASSIGNER": "cert@cert.org",
+        "DATE_PUBLIC": "2022-09-27T01:00:00.000Z",
+        "TITLE": "L2 network filtering can be bypassed using stacked VLAN0 and LLC/SNAP headers",
+        "STATE": "PUBLIC"
+    },
+    "source": {
+	"discovery": "EXTERNAL"
+    },
+    "affects": {
+        "vendor": {
+            "vendor_data": [
+                {
+                    "vendor_name": "IEEE",
+                    "product": {
+                        "product_data": [
+                            {
+                                "product_name": "802.2",
+                                "version": {
+                                    "version_data": [
+                                        {
+                                            "version_name": "802.2h-1997",
+                                            "version_affected": "<=",
+                                            "version_value": "802.2h-1997"
+                                        }
+                                    ]
+                                }
+                            }
+                        ]
+                    }
+                },
+                {
+                    "vendor_name": "IETF",
+                    "product": {
+                        "product_data": [
+                            {
+                                "product_name": "draft-ietf-v6ops-ra-guard",
+                                "version": {
+                                    "version_data": [
+                                        {
+                                            "version_name": "08",
+                                            "version_affected": "<=",
+                                            "version_value": "08"
+                                        }
+                                    ]
+                                }
+                            }
+                        ]
+                    }
+                },
+                {
+                    "vendor_name": "IETF",
+                    "product": {
+                        "product_data": [
+                            {
+                                "product_name": "P802.1Q",
+                                "version": {
+                                    "version_data": [
+                                        {
+                                            "version_name": "D1.0",
+                                            "version_affected": "<=",
+                                            "version_value": "D1.0"
+                                        }
+                                    ]
+                                }
+                            }
+                        ]
+                    }
+                }
+            ]
+        }
+    },
+    "problemtype": {
+        "problemtype_data": [
+            {
+                "description": [
+                    {
+                        "lang": "eng",
+                        "value": "CWE-290: Authentication Bypass by Spoofing"
+                    }
+                ]
+            }
+        ]
     },
     "description": {
         "description_data": [
             {
                 "lang": "eng",
-                "value": "** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided."
+                "value": "Layer 2 network filtering capabilities such as IPv6 RA guard or ARP inspection can be bypassed using combinations of VLAN 0 headers and LLC/SNAP headers."
             }
         ]
-    }
-}
\ No newline at end of file
+    },
+    "references": {
+        "reference_data": [
+            {
+                "refsource": "CONFIRM",
+                "url": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/"
+            },
+            {
+                "refsource": "CONFIRM",
+                "url": "https://standards.ieee.org/ieee/802.2/1048/"
+            },
+            {
+                "refsource": "CONFIRM",
+                "url": "https://standards.ieee.org/ieee/802.1Q/10323/"
+            }
+        ]
+    },
+    "credit": [
+        {
+            "lang": "eng",
+            "value": "Etienne Champetier (@champtar) <champetier.etienne@gmail.com> "
+        }
+    ]
+}