CVE-2021-4247Public exploitNetwork attack vector

Authenticated server crash via undefined response dereference

Published Dec 18, 2022 · Updated Apr 15, 2025

Denial of service in OWASP Foundation NodeGoat allows remote authenticated users to crash the server through crafted research-page query parameters. The research handler passes the supplied URL and symbol to Needle, then dereferences newResponse.body when a failed outbound request leaves newResponse undefined. Access to the authenticated research route is required, and successful exploitation interrupts the NodeGoat process until it is restarted.

CVSS severity4.3
Medium
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in OWASP Foundation NodeGoat allows remote authenticated users to crash the server through crafted research-page query parameters. The research handler passes the supplied URL and symbol to Needle, then dereferences newResponse.body when a failed outbound request leaves newResponse undefined. Access to the authenticated research route is required, and successful exploitation interrupts the NodeGoat process until it is restarted.

The record

CVE
CVE-2021-4247
Published
Dec 18, 2022
Updated
Apr 15, 2025
Vendor
OWASP Foundation
Product
NodeGoat
Classifications
CWE-404, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 18, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OWASP Foundation · NodeGoatversion=n/a

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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