CVE-2021-21254
CVSS V2 Medium 4
CVSS V3 Medium 6.5
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 <= 24.0.0. The problem has been recognized and patched. The fix will be available in version 25.0.0.
Overview
- CVE ID
- CVE-2021-21254
- Assigner
- security-advisories@github.com
- Vulnerability Status
- Analyzed
- Published Version
- 2021-01-29T22:15:14
- Last Modified Date
- 2022-08-09T17:31:10
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:ckeditor:ckeditor5:*:*:*:*:*:*:*:* | 1 | OR | 25.0.0 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:L/Au:S/C:N/I:N/A:P
- Access Vector
- NETWORK
- Access Compatibility
- LOW
- Authentication
- SINGLE
- Confidentiality Impact
- NONE
- Integrity Impact
- NONE
- Availability Impact
- PARTIAL
- Base Score
- 4
- Severity
- MEDIUM
- Exploitability Score
- 8
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- NONE
- Availability Impact
- HIGH
- Base Score
- 6.5
- Base Severity
- MEDIUM
- Exploitability Score
- 2.8
- Impact Score
- 3.6
References
| Reference URL | Reference Tags |
|---|---|
| https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0 | Release Notes Third Party Advisory |
| https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm | Release Notes Third Party Advisory |
| https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wr | Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-21254 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21254 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 07:25:13 | Added to TrackCVE | |||
| 2022-12-05 21:08:03 | 2021-01-29T22:15Z | 2021-01-29T22:15:14 | CVE Published Date | updated |
| 2022-12-05 21:08:03 | 2022-08-09T17:31:10 | CVE Modified Date | updated | |
| 2022-12-05 21:08:03 | Analyzed | Vulnerability Status | updated |