FKIE_CVE-2021-41816

Vulnerability from fkie_nvd - Published: 2022-02-06 21:15 - Updated: 2026-06-17 04:08
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
cve@mitre.orghttps://hackerone.com/reports/1328463Permissions Required, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/
cve@mitre.orghttps://security-tracker.debian.org/tracker/CVE-2021-41816Third Party Advisory
cve@mitre.orghttps://security.gentoo.org/glsa/202401-27
cve@mitre.orghttps://security.netapp.com/advisory/ntap-20220303-0006/Third Party Advisory
cve@mitre.orghttps://www.ruby-lang.org/en/news/2021/11/24/buffer-overrun-in-cgi-escape_html-cve-2021-41816/Exploit, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://hackerone.com/reports/1328463Permissions Required, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/
af854a3a-2127-422b-91ae-364da2661108https://security-tracker.debian.org/tracker/CVE-2021-41816Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202401-27
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20220303-0006/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.ruby-lang.org/en/news/2021/11/24/buffer-overrun-in-cgi-escape_html-cve-2021-41816/Exploit, Vendor Advisory
Impacted products
Vendor Product Version
ruby-lang cgi *
ruby-lang cgi *
ruby-lang ruby *
ruby-lang cgi *
ruby-lang ruby *
fedoraproject fedora 34
fedoraproject fedora 35
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
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              "versionEndExcluding": "0.3.1",
              "vulnerable": true
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "El archivo CGI.escape_html en Ruby versiones anteriores a 2.7.5 y 3.x versiones anteriores a 3.0.3, presenta un desbordamiento de enteros y un desbordamiento de b\u00fafer resultante por medio de una cadena larga en plataformas (como Windows) donde size_t y long tienen diferentes n\u00fameros de bytes. Esto tambi\u00e9n afecta a CGI gem versiones anteriores a 0.3.1 para Ruby"
    }
  ],
  "id": "CVE-2021-41816",
  "lastModified": "2026-06-17T04:08:57.320",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 7.5,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2022-02-06T21:15:07.887",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Permissions Required",
        "Third Party Advisory"
      ],
      "url": "https://hackerone.com/reports/1328463"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
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      "url": "https://security-tracker.debian.org/tracker/CVE-2021-41816"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://security.gentoo.org/glsa/202401-27"
    },
    {
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      "tags": [
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      "tags": [
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      "url": "https://www.ruby-lang.org/en/news/2021/11/24/buffer-overrun-in-cgi-escape_html-cve-2021-41816/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://hackerone.com/reports/1328463"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/"
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://security-tracker.debian.org/tracker/CVE-2021-41816"
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      "url": "https://security.gentoo.org/glsa/202401-27"
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://security.netapp.com/advisory/ntap-20220303-0006/"
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      "url": "https://www.ruby-lang.org/en/news/2021/11/24/buffer-overrun-in-cgi-escape_html-cve-2021-41816/"
    }
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  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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