CVE-2021-33829
MEDIUM
6.1
CVSS Score
Published: June 9, 2021 at 11:51 AM UTC
Updated: June 17, 2026 at 03:55 AM UTC
4 products affected across 4 vendorsDebian LinuxFedoraDrupal
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Severity
MEDIUM6.1
Exploit prediction
EPSS 3%
Description
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Ckeditor· Ckeditordrupal
95%4.14.0 ≤ v < 4.16.1
Affected range stops below 4.16.1, so it looks safe — our inference, not a vendor statement
Debian Linux· Debiandrupal
95%8.9.0 ≤ v < 8.9.169.0.0 ≤ v < 9.0.149.1.0 ≤ v < 9.1.9
Affected range stops below 8.9.16, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.1.9, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://ckeditor.com/blog/ckeditor-4.16.1-with-accessibility-enhancements/#improvements-for-comments-in-html-parser
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD/
- https://www.drupal.org/sa-core-2021-003
References (6)
x_refsource_MISCPatchRelease NotesVendor Advisory
Source: [email protected]
https://ckeditor.com/blog/ckeditor-4.16.1-with-accessibility-enhancements/#improvements-for-comments-in-html-parserMailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2021/11/msg00007.htmlVendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T/Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW/Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD/x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://www.drupal.org/sa-core-2021-003CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- CHANGED
- Confidentiality
- LOW
- Integrity
- LOW
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-79
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