6.5
MEDIUM
CVE-2021-26271
CKEditor 4 Denial of Service Vuln
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).

INFO

Published Date :

Jan. 26, 2021, 9:15 p.m.

Last Modified :

Dec. 1, 2021, 4:16 p.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2021-26271 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Oracle webcenter_sites
2 Oracle siebel_ui_framework
3 Oracle jd_edwards_enterpriseone_tools
4 Oracle agile_plm
5 Oracle financial_services_analytical_applications_infrastructure
6 Oracle application_express
1 Ckeditor ckeditor
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-26271.

URL Resource
https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first Vendor Advisory
https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416 Release Notes Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.html Patch Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html Patch Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-26271 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-26271 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Modified Analysis by [email protected]

    Dec. 01, 2021

    Action Type Old Value New Value
    Changed Reference Type https://www.oracle.com//security-alerts/cpujul2021.html No Types Assigned https://www.oracle.com//security-alerts/cpujul2021.html Patch, Third Party Advisory
    Changed Reference Type https://www.oracle.com/security-alerts/cpuoct2021.html No Types Assigned https://www.oracle.com/security-alerts/cpuoct2021.html Patch, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:oracle:agile_plm:9.3.5:*:*:*:*:*:*:* *cpe:2.3:a:oracle:agile_plm:9.3.6:*:*:*:*:*:*:* *cpe:2.3:a:oracle:application_express:*:*:*:*:*:*:*:* versions up to (excluding) 21.1.0 *cpe:2.3:a:oracle:financial_services_analytical_applications_infrastructure:*:*:*:*:*:*:*:* versions from (including) 8.0.6 up to (including) 8.0.9 *cpe:2.3:a:oracle:financial_services_analytical_applications_infrastructure:8.1.0:*:*:*:*:*:*:* *cpe:2.3:a:oracle:financial_services_analytical_applications_infrastructure:8.1.1:*:*:*:*:*:*:* *cpe:2.3:a:oracle:jd_edwards_enterpriseone_tools:*:*:*:*:*:*:*:* versions up to (excluding) 9.2.6.0 *cpe:2.3:a:oracle:siebel_ui_framework:*:*:*:*:*:*:*:* versions up to (excluding) 21.9 *cpe:2.3:a:oracle:webcenter_sites:12.2.1.3.0:*:*:*:*:*:*:* *cpe:2.3:a:oracle:webcenter_sites:12.2.1.4.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Oct. 20, 2021

    Action Type Old Value New Value
    Added Reference https://www.oracle.com/security-alerts/cpuoct2021.html [No Types Assigned]
  • CVE Modified by [email protected]

    Jul. 20, 2021

    Action Type Old Value New Value
    Added Reference https://www.oracle.com//security-alerts/cpujul2021.html [No Types Assigned]
  • Modified Analysis by [email protected]

    Feb. 08, 2021

    Action Type Old Value New Value
    Changed Reference Type https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first No Types Assigned https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first Vendor Advisory
  • CVE Modified by [email protected]

    Feb. 04, 2021

    Action Type Old Value New Value
    Added Reference https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first [No Types Assigned]
  • Initial Analysis by [email protected]

    Feb. 02, 2021

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
    Changed Reference Type https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416 No Types Assigned https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416 Release Notes, Third Party Advisory
    Added CWE NIST CWE-829
    Added CPE Configuration OR *cpe:2.3:a:ckeditor:ckeditor:*:*:*:*:*:*:*:* versions from (including) 4.0 up to (excluding) 4.16
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.15 }} 0.01%

score

0.50502

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability