CVE-2022-24729Network attack vector

Browser-tab freeze via dialog validator regex

Published Mar 16, 2022 · Updated Apr 23, 2025

Regular expression denial of service in CKSource CKEditor 4 before 4.18.0 allows remote attackers to freeze a browser tab via dialog input. The dialog plugin applies a vulnerable validator regular expression to attacker-controlled input, causing excessive processing. An affected dialog-dependent plugin must be available and user interaction is required; the reported consequence is limited to the active browser tab.

CVSS severity6.5
Medium
EPSS probability2.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in CKSource CKEditor 4 before 4.18.0 allows remote attackers to freeze a browser tab via dialog input. The dialog plugin applies a vulnerable validator regular expression to attacker-controlled input, causing excessive processing. An affected dialog-dependent plugin must be available and user interaction is required; the reported consequence is limited to the active browser tab.

The record

CVE
CVE-2022-24729
Published
Mar 16, 2022
Updated
Apr 23, 2025
Vendor
CKSource
Product
CKEditor 4
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.18.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CKSource · CKEditor 4version=< 4.18.0

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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