Apple watchOS up to 7.3.2 WebKit cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Apple watchOS up to 7.3.2. The impacted element is an unknown function of the component WebKit. Executing a manipulation can lead to cross site scripting. The identification of this vulnerability is CVE-2021-1879. The attack may be launched remotely. Furthermore, there is an exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Apple watchOS up to 7.3.2 (Smartwatch Operating System) and classified as problematic. This vulnerability affects an unknown code block of the component WebKit. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity.

The weakness was shared 03/26/2021 by Clement Lecigne as HT212258 as confirmed advisory (Website). The advisory is shared for download at support.apple.com. This vulnerability was named CVE-2021-1879. Successful exploitation requires user interaction by the victim. Technical details are unknown but an exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007. The advisory points out:

Processing maliciously crafted web content may lead to universal cross site scripting. Apple is aware of a report that this issue may have been actively exploited.

It is declared as attacked. This issue was added on 11/03/2021 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 11/17/2021:

Apply updates per vendor instructions.

Upgrading to version 7.3.3 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

This issue was addressed by improved management of object lifetimes.

The vulnerability is also documented in the databases at Zero-Day.cz (616) and EUVD (EUVD-2021-7343). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

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

NVD Base Score: 6.1
NVD Vector: 🔍

CNA Base Score: 6.1
CNA Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
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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Zero-Day.cz: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: watchOS 7.3.3

Timelineinfo

12/08/2020 🔍
03/26/2021 +108 days 🔍
03/26/2021 +0 days 🔍
03/27/2021 +1 days 🔍
07/29/2025 +1585 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT212258
Researcher: Clement Lecigne
Status: Confirmed

CVE: CVE-2021-1879 (🔍)
GCVE (CVE): GCVE-0-2021-1879
GCVE (VulDB): GCVE-100-171904
EUVD: 🔍
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/27/2021 17:58
Updated: 07/29/2025 06:02
Changes: 03/27/2021 17:58 (18), 03/27/2021 18:02 (28), 04/06/2021 11:24 (5), 04/20/2024 13:27 (26), 05/15/2024 17:15 (2), 06/29/2024 13:49 (2), 09/11/2024 23:15 (1), 01/30/2025 00:15 (28), 05/04/2025 03:00 (3), 07/29/2025 06:02 (1)
Complete: 🔍
Cache ID: 216::103

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

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