VDB-185816 · CVE-2021-42694 · GCVE-0-2021-42694

Unicode Specification up to 14.0 Homoglyph source code ⚔ [Disputed]

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.
7.1	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Unicode Specification up to 14.0. This issue affects some unknown processing of the component Homoglyph Handler. Such manipulation leads to source code. This vulnerability is documented as CVE-2021-42694. The attack can be executed remotely. Additionally, an exploit exists. The actual existence of this vulnerability is currently in question.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Unicode Specification up to 14.0. Affected by this issue is an unknown functionality of the component Homoglyph Handler. The manipulation with an unknown input leads to a source code vulnerability. Using CWE to declare the problem leads to CWE-18. Impacted is confidentiality, integrity, and availability.

The weakness was released 11/01/2021. The advisory is shared for download at unicode.org. This vulnerability is handled as CVE-2021-42694 since 10/18/2021. Successful exploitation requires user interaction by the victim. Technical details are unknown but a public exploit is available.

The exploit is available at trojansource.codes. It is declared as proof-of-concept. The real existence of this vulnerability is still doubted at the moment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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

Productinfo

Vendor

Unicode

Name

Specification

Version

14.0

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.2
VulDB Meta Temp Score: 7.1

VulDB Base Score: 5.0
VulDB Temp Score: 4.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.3
NVD Vector: 🔍

CNA Base Score: 8.3
CNA Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Source code
CWE: CWE-18 / CWE-17
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/18/2021 🔍
11/01/2021 +14 days 🔍
11/01/2021 +0 days 🔍
05/02/2025 +1278 days 🔍

Sourcesinfo

Advisory: unicode.org
Status: Confirmed
Disputed: 🔍

CVE: CVE-2021-42694 (🔍)
GCVE (CVE): GCVE-0-2021-42694
GCVE (VulDB): GCVE-100-185816
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 11/01/2021 09:06
Updated: 05/02/2025 23:11
Changes: 11/01/2021 09:06 (40), 11/04/2021 11:43 (1), 11/04/2021 11:51 (18), 07/18/2024 21:15 (25), 08/01/2024 17:28 (11), 05/02/2025 23:11 (3)
Complete: 🔍
Cache ID: 216::103