Apple watchOS up to 9.3.1 Calendar information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in Apple watchOS up to 9.3.1. Affected is an unknown function of the component Calendar. This manipulation causes information disclosure. This vulnerability is tracked as CVE-2023-27961. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Apple watchOS up to 9.3.1 (Smartwatch Operating System). It has been declared as problematic. Affected by this vulnerability is some unknown processing of the component Calendar. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

Multiple validation issues were addressed with improved input sanitization. This issue is fixed in macOS Ventura 13.3, iOS 16.4 and iPadOS 16.4, iOS 15.7.4 and iPadOS 15.7.4, macOS Monterey 12.6.4, watchOS 9.4, macOS Big Sur 11.7.5. Importing a maliciously crafted calendar invitation may exfiltrate user information.

The weakness was disclosed 03/27/2023 by Rıza Sabuncu as HT213678 as confirmed advisory (Website). The advisory is shared at support.apple.com. This vulnerability is known as CVE-2023-27961. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue. The advisory points out:

Importing a maliciously crafted calendar invitation may exfiltrate user information

Upgrading to version 9.4 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

Multiple validation issues were addressed with improved input sanitization.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-31687). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.8

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: watchOS 9.4

Timelineinfo

03/08/2023 🔍
03/27/2023 +18 days 🔍
03/27/2023 +0 days 🔍
03/29/2023 +2 days 🔍
11/30/2025 +977 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT213678
Researcher: Rıza Sabuncu
Status: Confirmed

CVE: CVE-2023-27961 (🔍)
GCVE (CVE): GCVE-0-2023-27961
GCVE (VulDB): GCVE-100-224377
EUVD: 🔍

Entryinfo

Created: 03/29/2023 14:45
Updated: 11/30/2025 06:01
Changes: 03/29/2023 14:45 (18), 03/29/2023 14:48 (28), 04/19/2023 09:06 (1), 12/12/2024 17:55 (27), 04/27/2025 15:08 (3), 11/30/2025 06:01 (1)
Complete: 🔍
Cache ID: 216::103

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

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