6.5

CVE-2021-26271: ckeditor

CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2021-26271DEBIAN-CVE-2021-26271GHSA-jv4c-7jqq-m34x
Published 26-01-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-26271 is a medium (CVSS 6.5) vulnerability in ckeditor. EPSS estimates a 1.97% chance of exploitation in the next 30 days, higher than 80% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
1.97%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 26-01-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

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).

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

1.97%

Chance of exploitation in the next 30 days

Percentile

80%

Versus all other CVEs

30-day change

0.00 pp

From 1.97% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.97%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Oracle6 products
Ckeditor1 product
Debian1 product
  • ckeditor< 4.16.0+dfsg-1
Npm1 product
  • ckeditor4-dev< 4.16
Ubuntu1 product
  • ckeditorAll versions (No fix recorded)

5 vendors · 10 products

References

10 links