diff --git a/2021/29xxx/CVE-2021-29509.json b/2021/29xxx/CVE-2021-29509.json
index e009f2d21de..1c6088245d7 100644
--- a/2021/29xxx/CVE-2021-29509.json
+++ b/2021/29xxx/CVE-2021-29509.json
@@ -1,18 +1,101 @@
 {
-    "data_type": "CVE",
-    "data_format": "MITRE",
-    "data_version": "4.0",
     "CVE_data_meta": {
+        "ASSIGNER": "security-advisories@github.com",
         "ID": "CVE-2021-29509",
-        "ASSIGNER": "cve@mitre.org",
-        "STATE": "RESERVED"
+        "STATE": "PUBLIC",
+        "TITLE": "Keepalive Connections Causing Denial Of Service in puma"
     },
+    "affects": {
+        "vendor": {
+            "vendor_data": [
+                {
+                    "product": {
+                        "product_data": [
+                            {
+                                "product_name": "puma",
+                                "version": {
+                                    "version_data": [
+                                        {
+                                            "version_value": "< 4.3.8"
+                                        },
+                                        {
+                                            "version_value": ">= 5.0.0, < 5.3.1"
+                                        }
+                                    ]
+                                }
+                            }
+                        ]
+                    },
+                    "vendor_name": "puma"
+                }
+            ]
+        }
+    },
+    "data_format": "MITRE",
+    "data_type": "CVE",
+    "data_version": "4.0",
     "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": "Puma is a concurrent HTTP 1.1 server for Ruby/Rack applications. The fix for CVE-2019-16770 was incomplete. The original fix only protected existing connections that had already been accepted from having their requests starved by greedy persistent-connections saturating all threads in the same process. However, new connections may still be starved by greedy persistent-connections saturating all threads in all processes in the cluster. A `puma` server which received more concurrent `keep-alive` connections than the server had threads in its threadpool would service only a subset of connections, denying service to the unserved connections. This problem has been fixed in `puma` 4.3.8 and 5.3.1. Setting `queue_requests false` also fixes the issue. This is not advised when using `puma` without a reverse proxy, such as `nginx` or `apache`, because you will open yourself to slow client attacks (e.g. slowloris). The fix is very small and a git patch is available for those using unsupported versions of Puma."
             }
         ]
+    },
+    "impact": {
+        "cvss": {
+            "attackComplexity": "LOW",
+            "attackVector": "NETWORK",
+            "availabilityImpact": "HIGH",
+            "baseScore": 7.5,
+            "baseSeverity": "HIGH",
+            "confidentialityImpact": "NONE",
+            "integrityImpact": "NONE",
+            "privilegesRequired": "NONE",
+            "scope": "UNCHANGED",
+            "userInteraction": "NONE",
+            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
+            "version": "3.1"
+        }
+    },
+    "problemtype": {
+        "problemtype_data": [
+            {
+                "description": [
+                    {
+                        "lang": "eng",
+                        "value": "{\"CWE-400\":\"Uncontrolled Resource Consumption\"}"
+                    }
+                ]
+            }
+        ]
+    },
+    "references": {
+        "reference_data": [
+            {
+                "name": "https://github.com/puma/puma/security/advisories/GHSA-q28m-8xjw-8vr5",
+                "refsource": "CONFIRM",
+                "url": "https://github.com/puma/puma/security/advisories/GHSA-q28m-8xjw-8vr5"
+            },
+            {
+                "name": "https://gist.github.com/nateberkopec/4b3ea5676c0d70cbb37c82d54be25837",
+                "refsource": "MISC",
+                "url": "https://gist.github.com/nateberkopec/4b3ea5676c0d70cbb37c82d54be25837"
+            },
+            {
+                "name": "https://github.com/puma/puma/security/policy",
+                "refsource": "MISC",
+                "url": "https://github.com/puma/puma/security/policy"
+            },
+            {
+                "name": "https://rubygems.org/gems/puma",
+                "refsource": "MISC",
+                "url": "https://rubygems.org/gems/puma"
+            }
+        ]
+    },
+    "source": {
+        "advisory": "GHSA-q28m-8xjw-8vr5",
+        "discovery": "UNKNOWN"
     }
 }
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