CVE-2021-26271

mediumpriority · track · 27EPSS 0.020 · 81 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.99% (81st) EPSS

CVSS 4.3 · medium

Is it mine?

30 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.16.5mediumAV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:Hsecondary · OSV

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-829USprimaryCWE-1333USCWE-829US

affected products (30)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
Oracle Corp. Database Server≤ 21.1.0fstec_bduRU
Oracle Corp. Financial Services Analytical Applications Infrastructure≤ 8.1.0fstec_bduRU
Oracle Corp. Financial Services Analytical Applications Infrastructure≤ 8.1.1fstec_bduRU
Oracle Corp. Financial Services Analytical Applications Infrastructure8.0.6 → 8.0.9fstec_bduRU
Oracle Corp. JD Edwards EnterpriseOne Tools≤ 9.2.6.0fstec_bduRU
Oracle Corp. Oracle Agile PLM≤ 9.3.5fstec_bduRU
Oracle Corp. Oracle Agile PLM≤ 9.3.6fstec_bduRU
Oracle Corp. Oracle Financial Services Model Management and Governance8.0.8.0.0 → 8.1.0.0.0fstec_bduRU
Oracle Corp. Siebel UI Framework≤ 21.9fstec_bduRU
Oracle Corp. WebCenter Sites≤ 12.2.1.3.0fstec_bduRU
Oracle Corp. WebCenter Sites≤ 12.2.1.4.0fstec_bduRU
The CKEditor Team CKEditor4.0 → 4.16fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 10fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 9fstec_bduRU
Сообщество свободного программного обеспечения Debian GNU/Linux≤ 11fstec_bduRU
ckeditor ckeditor4.0 → 4.16nvdUScpe:2.3:a:ckeditor:ckeditor:*:*:*:*:*:*:*:*
oracle agile plm= 9.3.5nvdUScpe:2.3:a:oracle:agile_plm:*:*:*:*:*:*:*:*
oracle agile plm= 9.3.6nvdUScpe:2.3:a:oracle:agile_plm:*:*:*:*:*:*:*:*
oracle agile product lifecycle management= 9.3.5nvdUScpe:2.3:a:oracle:agile_product_lifecycle_management:*:*:*:*:*:*:*:*

showing 20 of 30

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-jv4c-7jqq-m34xCKEditor 4 ReDoS Vulnerability2022-05-24ghsa · osvUS
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).

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd osv NVD CVE.org MITRE

published 2021-01-26modified 2026-06-17

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references (15)

External citations — patches, advisories, analysis.

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