diff --git a/2019/18xxx/CVE-2019-18840.json b/2019/18xxx/CVE-2019-18840.json
new file mode 100644
index 00000000000..2ef74fe9135
--- /dev/null
+++ b/2019/18xxx/CVE-2019-18840.json
@@ -0,0 +1,76 @@
+{
+    "CVE_data_meta": {
+        "ASSIGNER": "cve@mitre.org",
+        "ID": "CVE-2019-18840",
+        "STATE": "PUBLIC"
+    },
+    "affects": {
+        "vendor": {
+            "vendor_data": [
+                {
+                    "product": {
+                        "product_data": [
+                            {
+                                "product_name": "n/a",
+                                "version": {
+                                    "version_data": [
+                                        {
+                                            "version_value": "n/a"
+                                        }
+                                    ]
+                                }
+                            }
+                        ]
+                    },
+                    "vendor_name": "n/a"
+                }
+            ]
+        }
+    },
+    "data_format": "MITRE",
+    "data_type": "CVE",
+    "data_version": "4.0",
+    "description": {
+        "description_data": [
+            {
+                "lang": "eng",
+                "value": "In wolfSSL 4.1.0 through 4.2.0c, there are missing sanity checks of memory accesses in parsing ASN.1 certificate data while handshaking. Specifically, there is a one-byte heap-based buffer overflow inside the DecodedCert structure in GetName in wolfcrypt/src/asn.c because the domain name location index is mishandled. Because a pointer is overwritten, there is an invalid free."
+            }
+        ]
+    },
+    "problemtype": {
+        "problemtype_data": [
+            {
+                "description": [
+                    {
+                        "lang": "eng",
+                        "value": "n/a"
+                    }
+                ]
+            }
+        ]
+    },
+    "references": {
+        "reference_data": [
+            {
+                "url": "https://github.com/wolfSSL/wolfssl/issues/2555",
+                "refsource": "MISC",
+                "name": "https://github.com/wolfSSL/wolfssl/issues/2555"
+            }
+        ]
+    },
+    "impact": {
+        "cvss": {
+            "attackComplexity": "LOW",
+            "attackVector": "NETWORK",
+            "availabilityImpact": "HIGH",
+            "confidentialityImpact": "NONE",
+            "integrityImpact": "NONE",
+            "privilegesRequired": "NONE",
+            "scope": "UNCHANGED",
+            "userInteraction": "NONE",
+            "vectorString": "CVSS:3.0/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N",
+            "version": "3.0"
+        }
+    }
+}
\ No newline at end of file