VDB-168792 · CVE-2021-26271 · Nessus 242323

CKeditor up to 4.15 Dialogs Plugin incorrect regex

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.2	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in CKeditor up to 4.15. This affects an unknown function of the component Dialogs Plugin. The manipulation results in incorrect regex. This vulnerability is reported as CVE-2021-26271. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in CKeditor up to 4.15. It has been classified as critical. Affected is an unknown functionality of the component Dialogs Plugin. The manipulation with an unknown input leads to a incorrect regex vulnerability. CWE is classifying the issue as CWE-185. The product specifies a regular expression in a way that causes data to be improperly matched or compared. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was disclosed 01/27/2021. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2021-26271. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 242323 (IBM Engineering Requirements Management DOORS 9.7.2.9 < 9.7.2.10 Multiple Vulnerabilities (7238992)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.16 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (242323). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

CKeditor

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Incorrect regex
CWE: CWE-185 / CWE-697
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 242323
Nessus Name: IBM Engineering Requirements Management DOORS 9.7.2.9 < 9.7.2.10 Multiple Vulnerabilities (7238992)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: CKeditor 4.16

Timelineinfo

01/26/2021 🔍
01/27/2021 +1 days 🔍
01/27/2021 +0 days 🔍
07/21/2025 +1636 days 🔍

Sourcesinfo

Advisory: github.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-26271 (🔍)
GCVE (CVE): GCVE-0-2021-26271
GCVE (VulDB): GCVE-100-168792

Entryinfo

Created: 01/27/2021 12:36
Updated: 07/21/2025 23:28
Changes: 01/27/2021 12:36 (19), 01/27/2021 12:37 (18), 02/20/2021 18:38 (6), 02/20/2021 18:42 (18), 07/21/2025 23:28 (17)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.