Is CVE-2021-26272 in the CISA KEV catalog?

No. CVE-2021-26272 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26272?

CVE-2021-26272 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-26272?

CVE-2021-26272 has an EPSS score of 2.22% (81th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26272?

Upgrade ckeditor on debian 11 to 4.16.0+dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-26272

MEDIUMEPSS 81th pctl

6.5

CVSS v3

NVD

Description

It was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted URL-like text into the editor, and then press Enter or Space (in the Autolink plugin).

CWE-829

How to fix

Remediation Available

ckeditorDebian

Fixed in:4.16.0+dfsg-1CVE-2021-26272

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploit Intelligence

2.22%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

Patch2

Vendor Advisory1

ckeditor.com

Third-Party Advisory2

Related Vulnerabilities

Other CWE-829 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-17246	Critical	9.8	82%	-	Fix
CVE-2024-5762	High	8.1	72%	-	-
CVE-2018-7422	High	7.5	63%	-	-
CVE-2023-2249	High	8.8	61%	-	-
CVE-2025-32463	Critical	9.3	48%	KEV	Fix
CVE-2024-38476	Critical	9.8	42%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.