CVE-2021-22883 (GCVE-0-2021-22883)

Vulnerability from cvelistv5 – Published: 2021-03-03 17:38 – Updated: 2025-04-30 22:24
VLAI
Summary
Node.js before 10.24.0, 12.21.0, 14.16.0, and 15.10.0 is vulnerable to a denial of service attack when too many connection attempts with an 'unknownProtocol' are established. This leads to a leak of file descriptors. If a file descriptor limit is configured on the system, then the server is unable to accept new connections and prevent the process also from opening, e.g. a file. If no file descriptor limit is configured, then this lead to an excessive memory usage and cause the system to run out of memory.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-400 - Denial of Service (CWE-400)
Assigner
References
Impacted products
Vendor Product Version
NodeJS Node Affected: 4.0 , < 4.* (semver)
Affected: 5.0 , < 5.* (semver)
Affected: 6.0 , < 6.* (semver)
Affected: 7.0 , < 7.* (semver)
Affected: 8.0 , < 8.* (semver)
Affected: 9.0 , < 9.* (semver)
Affected: 10.0 , < 10.24.0 (semver)
Affected: 11.0 , < 11.* (semver)
Affected: 12.0 , < 12.21.0 (semver)
Affected: 13.0 , < 13.* (semver)
Affected: 14.0 , < 14.16.0 (semver)
Affected: 15.0 , < 15.10.0 (semver)
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-06-28T12:01:02+00:00",
      "cve": "CVE-2021-22883",
      "id": "CVE-2021-22883",
      "initial_release_date": "2021-02-20T00:00:00+00:00",
      "product_status:fixed": "354",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "6",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "nodejs: HTTP2 \u0027unknownProtocol\u0027 cause DoS by resource exhaustion",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-22883.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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.


Detection rules are retrieved from Rulezet.