Log4Shell (CVE-2021-44228)

GEThttps://api.deepinfo.com/v1/explore/vulnerability-insight/epss-history/{cve}

The EPSS history of Log4Shell, 0.99999 with percentile 1.0 on every day shown, the top of the scale.

Param: cve
CVE: CVE-2021-44228

Asks for the EPSS history of CVE-2021-44228 (Log4Shell).

What to Notice

records has one entry per day, newest first; the API returned 1,656 days and this page shows 10. Every one shown has epss 0.99999 and percentile 1.0.

Request

curl

curl 'https://api.deepinfo.com/v1/explore/vulnerability-insight/epss-history/CVE-2021-44228' \
  -H 'apikey: YOUR_API_KEY' \
  -H 'Accept: application/json'

Python

import requests

url = "https://api.deepinfo.com/v1/explore/vulnerability-insight/epss-history/CVE-2021-44228"

headers = {
    "apikey": "YOUR_API_KEY",
    "Accept": "application/json"
}

response = requests.get(url, headers=headers)
response.raise_for_status()
print(response.json())

JavaScript

const url = "https://api.deepinfo.com/v1/explore/vulnerability-insight/epss-history/CVE-2021-44228";

const response = await fetch(url, {
  method: "GET",
  headers: {
    "apikey": "YOUR_API_KEY",
    "Accept": "application/json"
  },
});

const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	req, err := http.NewRequest("GET", "https://api.deepinfo.com/v1/explore/vulnerability-insight/epss-history/CVE-2021-44228", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("apikey", "YOUR_API_KEY")
	req.Header.Set("Accept", "application/json")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	body, err := io.ReadAll(res.Body)
	if err != nil {
		panic(err)
	}
	fmt.Println(string(body))
}

Java

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class Main {
    public static void main(String[] args) throws Exception {
        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://api.deepinfo.com/v1/explore/vulnerability-insight/epss-history/CVE-2021-44228"))
            .header("apikey", "YOUR_API_KEY")
            .header("Accept", "application/json")
            .GET()
            .build();

        HttpResponse<String> response = HttpClient.newHttpClient()
            .send(request, HttpResponse.BodyHandlers.ofString());

        System.out.println(response.body());
    }
}

using System;
using System.Net.Http;

using var client = new HttpClient();

var request = new HttpRequestMessage(HttpMethod.Get, "https://api.deepinfo.com/v1/explore/vulnerability-insight/epss-history/CVE-2021-44228");
request.Headers.Add("apikey", "YOUR_API_KEY");
request.Headers.Add("Accept", "application/json");

using var response = await client.SendAsync(request);
Console.WriteLine(await response.Content.ReadAsStringAsync());

PHP

<?php

$curl = curl_init();

curl_setopt_array($curl, [
    CURLOPT_URL => 'https://api.deepinfo.com/v1/explore/vulnerability-insight/epss-history/CVE-2021-44228',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => [
        'apikey: YOUR_API_KEY',
        'Accept: application/json',
    ],
]);

$response = curl_exec($curl);

if ($response === false) {
    throw new RuntimeException(curl_error($curl));
}

echo $response . PHP_EOL;

Ruby

require 'net/http'
require 'uri'

uri = URI('https://api.deepinfo.com/v1/explore/vulnerability-insight/epss-history/CVE-2021-44228')

request = Net::HTTP::Get.new(uri)
request['apikey'] = 'YOUR_API_KEY'
request['Accept'] = 'application/json'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: uri.scheme == 'https') do |http|
  http.request(request)
end

puts response.body

Response

200 OK · application/json

Shortened for this page: records: 10 of 1,656 shown

Response Body

{
  "cve": "CVE-2021-44228",
  "records": [
    {
      "epss": 0.99999,
      "percentile": 1.0,
      "date": "2026-09-23"
    },
    {
      "epss": 0.99999,
      "percentile": 1.0,
      "date": "2026-09-22"
    },
    {
      "epss": 0.99999,
      "percentile": 1.0,
      "date": "2026-09-21"
    },
    {
      "epss": 0.99999,
      "percentile": 1.0,
      "date": "2026-09-20"
    },
    {
      "epss": 0.99999,
      "percentile": 1.0,
      "date": "2026-09-19"
    },
    {
      "epss": 0.99999,
      "percentile": 1.0,
      "date": "2026-09-18"
    },
    {
      "epss": 0.99999,
      "percentile": 1.0,
      "date": "2026-09-17"
    },
    {
      "epss": 0.99999,
      "percentile": 1.0,
      "date": "2026-09-16"
    },
    {
      "epss": 0.99999,
      "percentile": 1.0,
      "date": "2026-09-15"
    },
    {
      "epss": 0.99999,
      "percentile": 1.0,
      "date": "2026-09-14"
    }
  ]
}

Content-Type: application/json
ratelimit-limit: 1
ratelimit-remaining: 0
ratelimit-reset: 1
x-ratelimit-limit-second: 1
x-ratelimit-remaining-second: 0
deepinfo-request-id: 5f0c6a8e-1b2d-4c3e-9f4a-7b8c9d0e1f2a

Request

What this example sends. Every parameter is documented on EPSS History; the exact request is in the code panel.

Parameter	Value
`cve`path	`CVE-2021-44228`

Reference updated September 24, 2026

Request

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