How severe is CVE-2021-41164?

CVE-2021-41164 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity low, and availability low.

Is CVE-2021-41164 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-41164?

CVE-2021-41164 primarily affects Ckeditor. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-41164?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-41164 published?

CVE-2021-41164 was published on 2021-11-17 and last updated on 2026-06-17.

CVE-2021-41164

CVE-2021-41164 is a high-severity vulnerability in Ckeditor with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 8.2)
CVSS v2: 3.5
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Ckeditor
Published: 2021-11-17
Last modified: 2026-06-17

Description

CKEditor4 is an open source WYSIWYG HTML editor. In affected versions a vulnerability has been discovered in the Advanced Content Filter (ACF) module and may affect all plugins used by CKEditor 4. The vulnerability allowed to inject malformed HTML bypassing content sanitization, which could result in executing JavaScript code. It affects all users using the CKEditor 4 at version < 4.17.0. The problem has been recognized and patched. The fix will be available in version 4.17.0.

Frequently asked questions

What is CVE-2021-41164?: CKEditor4 is an open source WYSIWYG HTML editor. In affected versions a vulnerability has been discovered in the Advanced Content Filter (ACF) module and may affect all plugins used by CKEditor 4. The vulnerability allowed to inject malformed HTML bypassing content sanitization, which could result in executing JavaScript code. It affects all users using the CKEditor 4 at version < 4.17.0. The problem has been recognized and patched. The fix will be available in version 4.17.0.
How severe is CVE-2021-41164?: CVE-2021-41164 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity low, and availability low.
Is CVE-2021-41164 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-41164?: CVE-2021-41164 primarily affects Ckeditor. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-41164?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-41164 published?: CVE-2021-41164 was published on 2021-11-17 and last updated on 2026-06-17.

References

Affected products (21)

cpe:2.3:a:ckeditor:ckeditor:*:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_apis:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_apis:19.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_apis:19.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_apis:20.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_apis:21.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_digital_experience:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_digital_experience:19.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_digital_experience:19.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_digital_experience:20.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:banking_digital_experience:21.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:agile_plm:9.3.6:*:*:*:*:*:*:*
cpe:2.3:a:oracle:application_express:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:commerce_guided_search:11.3.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:*:*:*:*:*:*:*
cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.59:*:*:*:*:*:*:*
cpe:2.3:a:oracle:webcenter_portal:12.2.1.3.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:webcenter_portal:12.2.1.4.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*

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CVE-2021-41165 — High (CVSS 8.2): CKEditor4 is an open source WYSIWYG HTML editor. In affected version a vulnerability has been discovered in the core…
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