Apple tvOS WebKit type confusion

CVSS Meta Temp Score
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CTI Interest Score
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7.9$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Apple tvOS. Impacted is an unknown function of the component WebKit. Performing a manipulation results in type confusion. This vulnerability was named CVE-2021-1789. The attack may be initiated remotely. In addition, an exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Apple tvOS (Digital Media Player) (version now known). This affects some unknown processing of the component WebKit. The manipulation with an unknown input leads to a type confusion vulnerability. CWE is classifying the issue as CWE-843. The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was presented 02/01/2021 by S0rryMybad as confirmed advisory (Website). This vulnerability is uniquely identified as CVE-2021-1789 since 12/08/2020. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are unknown but an exploit is available.

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 241427 (RHEL 7 : webkitgtk4 (RHSA-2025:10364)), which helps to determine the existence of the flaw in a target environment. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 05/04/2022 with a due date of 05/25/2022:

Apply updates per vendor instructions.

Upgrading eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (241427). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.9

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

NVD Base Score: 8.8
NVD Vector: 🔍

CNA Base Score: 8.8
CNA Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Type confusion
CWE: CWE-843
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 241427
Nessus Name: RHEL 7 : webkitgtk4 (RHSA-2025:10364)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

12/08/2020 🔍
02/01/2021 +55 days 🔍
02/01/2021 +0 days 🔍
04/03/2021 +61 days 🔍
07/09/2025 +1558 days 🔍

Sourcesinfo

Vendor: apple.com

Researcher: S0rryMybad
Status: Confirmed

CVE: CVE-2021-1789 (🔍)
GCVE (CVE): GCVE-0-2021-1789
GCVE (VulDB): GCVE-100-172353
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 04/03/2021 12:28
Updated: 07/09/2025 11:53
Changes: 04/03/2021 12:28 (33), 04/09/2021 14:19 (9), 04/26/2024 05:34 (26), 09/22/2024 11:27 (1), 01/30/2025 00:05 (28), 05/04/2025 02:20 (3), 07/09/2025 11:53 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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