CVE-2021-33829: ckeditor Cross-site Scripting
CVSS: 6.1v3.1MediumModified
AliasesUBUNTU-CVE-2021-33829DEBIAN-CVE-2021-33829GHSA-rgx6-rjj4-c388BIT-drupal-2021-33829DRUPAL-CORE-2021-003
Published 09-06-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-33829 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in ckeditor. EPSS estimates a 3.19% chance of exploitation in the next 30 days, higher than 87.9% of scored vulnerabilities.
CVSS score
6.1/10
010
Medium · v3.1 (NVD)EPSS score
3.19%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 3 · Related 2Timeline
- 09-06-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 4 sources · 2 versionsMedium 6.1Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · NpmEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:P/A:NSourcesSingle source
EPSS trend
Probability
3.19%
Chance of exploitation in the next 30 days
Percentile
88%
Versus all other CVEs
30-day change
0.00 pp
From 3.19% on 19-09-2026
19-09-202619-10-2026
EPSS score3.19%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian3 products
- ckeditor< 4.16.0+dfsg-2
- ckeditor3All versions (No fix recorded)
- debian_linuxEOL9.0
Drupal3 products
- core≥ 7.0.0, < 7.80 | ≥ 8.0.0, < 8.9.16 | ≥ 9.0.0, < 9.0.14 | ≥ 9.1.0, < 9.1.9
- drupal≥ 7.0.0, < 7.80 | ≥ 8.0.0, < 8.9.16 | ≥ 9.0.0, < 9.0.14 | ≥ 9.1.0, < 9.1.9
- drupal≥ 8.9.0, < 8.9.16 | ≥ 9.0.0, < 9.0.14 | ≥ 9.1.0, < 9.1.9
Ckeditor1 product
- ckeditor≥ 4.14.0, < 4.16.1
Fedoraproject1 product
- fedoraEOL33 | 34 | 35
Npm1 product
- ckeditor4≥ 4.14.0, < 4.16.1
Ubuntu1 product
- ckeditor< 4.5.7+dfsg-2ubuntu0.16.04.1~esm1 | < 4.5.7+dfsg-2ubuntu0.18.04.1 | < 4.12.1+dfsg-1ubuntu0.1
6 vendors · 10 products
References
20 links- ckeditor.com/blog/ckeditor-4.16.1-with-accessibility-enhancements/X Refsource MISCREPORTWEBPatchRelease NotesVendor Advisory
lists.debian.org/debian-lts-announce/2021/11/msg00007.htmlMailing ListX Refsource MLISTWEBThird Party Advisory
