Vulnerability Details : CVE-2021-33829

A cross-site scripting (XSS) vulnerability in the HTML Data Processor in CKEditor 4 4.14.0 through 4.16.x before 4.16.1 allows remote attackers to inject executable JavaScript code through a crafted comment because --!> is mishandled.

Vulnerability category: Cross site scripting (XSS)

Published 2021-06-09 12:15:08

Updated 2021-11-23 21:32:32

Source MITRE

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-33829

Probability of exploitation activity in the next 30 days: 0.51%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 74 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-33829

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:N	8.6	2.9	nvd@nist.gov
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
6.1	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	2.8	2.7	nvd@nist.gov
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None

CWE ids for CVE-2021-33829

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-33829

https://lists.debian.org/debian-lts-announce/2021/11/msg00007.html

[SECURITY] [DLA 2813-1] ckeditor security update
Mailing List;Third Party Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW/

[SECURITY] Fedora 34 Update: ckeditor-4.16.2-1.fc34 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD/

[SECURITY] Fedora 33 Update: ckeditor-4.16.2-1.fc33 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url
https://ckeditor.com/blog/ckeditor-4.16.1-with-accessibility-enhancements/#improvements-for-comments-in-html-parser

Patch;Release Notes;Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T/

[SECURITY] Fedora 35 Update: ckeditor-4.16.2-1.fc35 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url
https://www.drupal.org/sa-core-2021-003

Drupal core - Moderately critical - Cross Site Scripting - SA-CORE-2021-003 | Drupal.org
Patch;Third Party Advisory

Products affected by CVE-2021-33829

Debian » Debian Linux » Version: 9.0
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
Matching versions
Drupal » Drupal
Versions from including (>=) 8.9.0 and before (<) 8.9.16
cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
Matching versions
Drupal » Drupal
Versions from including (>=) 9.0.0 and before (<) 9.0.14
cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
Matching versions
Drupal » Drupal
Versions from including (>=) 9.1.0 and before (<) 9.1.9
cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 33
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 34
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 35
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
Matching versions
Ckeditor » Ckeditor
Versions from including (>=) 4.14.0 and before (<) 4.16.1
cpe:2.3:a:ckeditor:ckeditor:*:*:*:*:*:*:*:*
Matching versions