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CVE-2021-41816 (GCVE-0-2021-41816)

Vulnerability from cvelistv5 – Published: 2022-02-06 00:00 – Updated: 2024-08-04 03:22
VLAI
Summary
CGI.escape_html in Ruby before 2.7.5 and 3.x before 3.0.3 has an integer overflow and resultant buffer overflow via a long string on platforms (such as Windows) where size_t and long have different numbers of bytes. This also affects the CGI gem before 0.3.1 for Ruby.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • n/a
Assigner
References
Show details on NVD website
To clipboard 

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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T11:05:39+00:00",
      "cve": "CVE-2021-41816",
      "id": "CVE-2021-41816",
      "initial_release_date": "2021-11-24T00:00:00+00:00",
      "product_status:fixed": "130",
      "product_status:known_not_affected": "259",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "ruby: buffer overflow in CGI.escape_html",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-41816.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "critical",
      "current_release_date": "2026-08-31T02:01:02Z",
      "cve": "CVE-2021-41816",
      "id": "CVE-2021-41816",
      "initial_release_date": "2023-02-15T03:37:24Z",
      "product_status:known_not_affected": "235",
      "product_status:recommended": "84",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-41816",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-41816.json",
      "version": "26"
    }
  }
}



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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.


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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.