CVE-2021-44224 (GCVE-0-2021-44224)

Vulnerability from cvelistv5 – Published: 2021-12-20 11:20 – Updated: 2024-08-04 04:17
VLAI
Title
Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier
Summary
A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).
Severity
No CVSS data available.
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
apache CNA under the mitre root
CNA scorecard B 76/100 over 1176 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Apache Software Foundation Apache HTTP Server Affected: 2.4.7 , < Apache HTTP Server 2.4* (custom)
guessed Create a notification for this product.
Credits
漂亮鼠 TengMA(@Te3t123)
Show details on NVD website
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        "cveTags": [],
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            "lang": "en",
            "value": "A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included)."
          },
          {
            "lang": "es",
            "value": "Un URI dise\u00f1ado que es enviado a httpd configurado como proxy directo (ProxyRequests on) puede causar un fallo (desreferencia de puntero NULL) o, en el caso de configuraciones que mezclan declaraciones de proxy directo e inverso, puede permitir que las peticiones se dirijan a un endpoint de socket de dominio Unix declarado (Server Side Request Forgery). Este problema afecta a Apache HTTP Server versiones 2.4.7 hasta 2.4.51 (incluy\u00e9ndola)"
          }
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        "id": "CVE-2021-44224",
        "lastModified": "2026-06-17T04:12:04.890",
        "metrics": {
          "cvssMetricV2": [
            {
              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
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                "accessVector": "NETWORK",
                "authentication": "NONE",
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                "confidentialityImpact": "NONE",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-07T13:25:39+00:00",
      "cve": "CVE-2021-44224",
      "id": "CVE-2021-44224",
      "initial_release_date": "2021-12-20T00:00:00+00:00",
      "product_status:fixed": "149",
      "product_status:known_affected": "7",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "httpd: possible NULL dereference or SSRF in forward proxy configurations",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-44224.json",
      "version": "3"
    }
  }
}



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Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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