Apple macOS up to 13.4.0 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 was found in Apple macOS up to 13.4.0. It has been classified as critical. This issue affects some unknown processing of the component WebKit. The manipulation leads to type confusion. This vulnerability is documented as CVE-2023-32439. The attack can be initiated remotely. Additionally, an exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Apple macOS up to 13.4.0 (Operating System). It has been rated as critical. This issue affects an unknown code block of the component WebKit. The manipulation with an unknown input leads to a type confusion vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability.

The weakness was released 06/21/2023 as HT213813 as confirmed advisory (Website). The advisory is shared at support.apple.com. The identification of this vulnerability is CVE-2023-32439. It demands that the victim is doing some kind of user interaction. Technical details are unknown but an exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/03/2026). It is expected to see the exploit prices for this product increasing in the near future. The advisory points out:

Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 239906 (TencentOS Server 3: webkit2gtk3 (TSSA-2023:0190)), which helps to determine the existence of the flaw in a target environment. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 06/23/2023 with a due date of 07/14/2023:

Apply updates per vendor instructions.

Upgrading to version 13.4.1 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

A type confusion issue was addressed with improved checks.

The vulnerability is also documented in the databases at Zero-Day.cz (782), Tenable (239906) and EUVD (EUVD-2023-36683). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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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

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

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: 239906
Nessus Name: TencentOS Server 3: webkit2gtk3 (TSSA-2023:0190)

Zero-Day.cz: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: macOS 13.4.1

Timelineinfo

05/08/2023 🔍
06/21/2023 +44 days 🔍
06/21/2023 +0 days 🔍
06/22/2023 +1 days 🔍
01/03/2026 +926 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT213813
Status: Confirmed

CVE: CVE-2023-32439 (🔍)
GCVE (CVE): GCVE-0-2023-32439
GCVE (VulDB): GCVE-100-232181
EUVD: 🔍
scip Labs: https://www.scip.ch/en/?labs.20180712

Entryinfo

Created: 06/22/2023 21:51
Updated: 01/03/2026 02:08
Changes: 06/22/2023 21:51 (18), 06/22/2023 21:55 (28), 07/17/2023 10:17 (2), 07/17/2023 10:23 (11), 04/29/2024 05:48 (26), 05/15/2024 17:15 (1), 06/10/2024 11:28 (2), 09/09/2024 22:30 (2), 02/03/2025 23:43 (11), 04/25/2025 10:41 (3), 06/18/2025 13:40 (2), 01/03/2026 02:08 (1)
Complete: 🔍
Cache ID: 216::103

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