CVE-2021-26271
CKEditor 4 ReDoS Vulnerability
6.5
MEDIUM
CVSS 3.1
EPSS 0.62%
Description
It was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted text into the Styles input of specific dialogs (in the Advanced Tab for Dialogs plugin).
How to fix CVE-2021-26271
To remediate CVE-2021-26271, upgrade the affected package to a fixed version below.
- Debian/ckeditor—upgrade to 4.16.0+dfsg-1 or later
- —upgrade to 4.16 or later
Is CVE-2021-26271 being exploited?
Low — EPSS is 0.6%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 4.16.0+dfsg-1
- from 0, < 4.16
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |