gsd-2021-21254
Vulnerability from gsd
Modified
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
{
"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"
}
},
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"ID": "CVE-2021-21254",
"STATE": "PUBLIC",
"TITLE": "Regular expression Denial of Service in Markdown plugin"
},
"affects": {
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"product": {
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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": [
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"description": [
{
"lang": "eng",
"value": "CWE-400 Uncontrolled Resource Consumption"
}
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}
]
},
"references": {
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{
"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",
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"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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"versionEndExcluding": "25.0.0",
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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,
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"severity": "MEDIUM",
"userInteractionRequired": false
},
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"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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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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