GSD-2021-21254

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
CKEditor 5 is an open source rich text editor framework with a modular architecture. The CKEditor 5 Markdown plugin (@ckeditor/ckeditor5-markdown-gfm) before version 25.0.0 has a regex denial of service (ReDoS) vulnerability. The vulnerability allowed to abuse link recognition regular expression, which could cause a significant performance drop resulting in browser tab freeze. It affects all users using CKEditor 5 Markdown plugin at version <= 24.0.0. The problem has been recognized and patched. The fix will be available in version 25.0.0.
Aliases
Aliases
CVE-2021-21254
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{
  "GSD": {
    "alias": "CVE-2021-21254",
    "description": "CKEditor 5 is an open source rich text editor framework with a modular architecture. The CKEditor 5 Markdown plugin (@ckeditor/ckeditor5-markdown-gfm) before version 25.0.0 has a regex denial of service (ReDoS) vulnerability. The vulnerability allowed to abuse link recognition regular expression, which could cause a significant performance drop resulting in browser tab freeze. It affects all users using CKEditor 5 Markdown plugin at version \u003c= 24.0.0. The problem has been recognized and patched. The fix will be available in version 25.0.0.",
    "id": "GSD-2021-21254"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-21254"
      ],
      "details": "CKEditor 5 is an open source rich text editor framework with a modular architecture. The CKEditor 5 Markdown plugin (@ckeditor/ckeditor5-markdown-gfm) before version 25.0.0 has a regex denial of service (ReDoS) vulnerability. The vulnerability allowed to abuse link recognition regular expression, which could cause a significant performance drop resulting in browser tab freeze. It affects all users using CKEditor 5 Markdown plugin at version \u003c= 24.0.0. The problem has been recognized and patched. The fix will be available in version 25.0.0.",
      "id": "GSD-2021-21254",
      "modified": "2023-12-13T01:23:10.991069Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-21254",
        "STATE": "PUBLIC",
        "TITLE": "Regular expression Denial of Service in Markdown plugin"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "ckeditor5",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "\u003c 25.0.0"
                        }
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            "value": "CKEditor 5 is an open source rich text editor framework with a modular architecture. The CKEditor 5 Markdown plugin (@ckeditor/ckeditor5-markdown-gfm) before version 25.0.0 has a regex denial of service (ReDoS) vulnerability. The vulnerability allowed to abuse link recognition regular expression, which could cause a significant performance drop resulting in browser tab freeze. It affects all users using CKEditor 5 Markdown plugin at version \u003c= 24.0.0. The problem has been recognized and patched. The fix will be available in version 25.0.0."
          }
        ]
      },
      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-400 Uncontrolled Resource Consumption"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wr",
            "refsource": "CONFIRM",
            "url": "https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wr"
          },
          {
            "name": "https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0",
            "refsource": "MISC",
            "url": "https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0"
          },
          {
            "name": "https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm",
            "refsource": "MISC",
            "url": "https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-hgmg-hhc8-g5wr",
        "discovery": "UNKNOWN"
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003c=24.0.0",
          "affected_versions": "All versions up to 24.0.0",
          "cvss_v2": "AV:N/AC:L/Au:S/C:N/I:N/A:P",
          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "cwe_ids": [
            "CWE-1035",
            "CWE-400",
            "CWE-937"
          ],
          "date": "2021-02-02",
          "description": "CKEditor 5 is an open source rich text editor framework with a modular architecture. The CKEditor 5 Markdown plugin (@ckeditor/ckeditor5-markdown-gfm) before version 25.0.0 has a regex denial of service (ReDoS) vulnerability. The vulnerability allowed to abuse link recognition regular expression, which could cause a significant performance drop resulting in browser tab freeze. It affects all users using CKEditor 5 Markdown plugin at version \u003c= 24.0.0. The problem has been recognized and patched. The fix will be available in version 25.0.0.",
          "fixed_versions": [
            "25.0.0"
          ],
          "identifier": "CVE-2021-21254",
          "identifiers": [
            "GHSA-hgmg-hhc8-g5wr",
            "CVE-2021-21254"
          ],
          "not_impacted": "All versions after 24.0.0",
          "package_slug": "npm/@ckeditor/ckeditor5-markdown-gfm",
          "pubdate": "2021-01-29",
          "solution": "Upgrade to version 25.0.0 or above.",
          "title": "Uncontrolled Resource Consumption",
          "urls": [
            "https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wr",
            "https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0",
            "https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm",
            "https://nvd.nist.gov/vuln/detail/CVE-2021-21254",
            "https://github.com/advisories/GHSA-hgmg-hhc8-g5wr"
          ],
          "uuid": "21905b71-ac1a-4ec9-9677-386ecfd4f249"
        },
        {
          "affected_range": "\u003c25.0.0",
          "affected_versions": "All versions before 25.0.0",
          "cvss_v2": "AV:N/AC:L/Au:S/C:N/I:N/A:P",
          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "cwe_ids": [
            "CWE-1035",
            "CWE-400",
            "CWE-937"
          ],
          "date": "2021-02-01",
          "description": "CKEditor 5 is an open source rich text editor framework with a modular architecture. The CKEditor 5 Markdown plugin (@ckeditor/ckeditor5-markdown-gfm) has a regex denial of service (ReDoS) vulnerability. The vulnerability allowed to abuse link recognition regular expression, which could cause a significant performance drop resulting in browser tab freeze. It affects all users using CKEditor 5 Markdown plugin at The problem has been recognized and patched.",
          "fixed_versions": [
            "25.0.0"
          ],
          "identifier": "CVE-2021-21254",
          "identifiers": [
            "CVE-2021-21254",
            "GHSA-hgmg-hhc8-g5wr"
          ],
          "not_impacted": "All versions starting from 25.0.0",
          "package_slug": "npm/ckeditor5",
          "pubdate": "2021-01-29",
          "solution": "Upgrade to version 25.0.0 or above.",
          "title": "Uncontrolled Resource Consumption",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2021-21254"
          ],
          "uuid": "ab784569-9297-4d02-b385-4d2fc732fe5f"
        }
      ]
    },
    "nvd.nist.gov": {
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        "nodes": [
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                "cpe23Uri": "cpe:2.3:a:ckeditor:ckeditor5:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "25.0.0",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
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          "ID": "CVE-2021-21254"
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        "description": {
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            }
          ]
        },
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            {
              "name": "https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0",
              "refsource": "MISC",
              "tags": [
                "Release Notes",
                "Third Party Advisory"
              ],
              "url": "https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0"
            },
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              "name": "https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm",
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            },
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            }
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      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "SINGLE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 4.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 8.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2022-08-09T17:31Z",
      "publishedDate": "2021-01-29T22:15Z"
    }
  }
}



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