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[email protected]CVE-2021-21254

HistoryJan 29, 2021 - 10:15 p.m.

CVE-2021-21254

2021-01-2922:15:14

CWE-400

[email protected]

web.nvd.nist.gov

ckeditor 5

redos vulnerability

markdown plugin

ddos

nvd

cve-2021-21254

4 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:S/C:N/I:N/A:P

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

0.001 Low

EPSS

Percentile

40.8%

JSON

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.

Affected configurations

Vulners

NVD

Node

ckeditorckeditor5Range<25.0.0

VendorProductVersionCPE
ckeditorckeditor5*cpe:2.3:a:ckeditor:ckeditor5:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
ckeditor	ckeditor5	*	cpe:2.3:a:ckeditor:ckeditor5::::::::

CNA Affected

[
  {
    "product": "ckeditor5",
    "vendor": "ckeditor",
    "versions": [
      {
        "status": "affected",
        "version": "< 25.0.0"
      }
    ]
  }
]