# Log4Shell (CVE-2021-44228)

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

Source: https://docs.deepinfo.com/reference/vulnerability/epss-history/examples/cve-2021-44228/

Last updated: 2026-09-24

---
`GET https://api.deepinfo.com/v1/explore/vulnerability-insight/epss-history/CVE-2021-44228`

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

Example 1 of 5 · [EPSS History Examples](/reference/vulnerability/epss-history/examples/) · endpoint: [EPSS History](/reference/vulnerability/epss-history/)

Tags: `param` `cve` · `value` `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

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

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

## Response

### 200 · OK

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

`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`

```json
{
  "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"
    }
  ]
}
```

## Related Examples

- [Heartbleed (CVE-2014-0160)](/reference/vulnerability/epss-history/examples/cve-2014-0160/)
- [Citrix Bleed (CVE-2023-4966)](/reference/vulnerability/epss-history/examples/cve-2023-4966/)
- [A CVE in the CISA KEV Catalog (CVE-2026-86218)](/reference/vulnerability/epss-history/examples/cve-2026-86218/)
- [A Recent CVE With a Low Score (CVE-2026-9508)](/reference/vulnerability/epss-history/examples/cve-2026-9508/)