Is CVE-2021-1879 actively exploited?

CVE-2021-1879 has no public evidence of in-the-wild exploitation as of 2025-10-23.

What is the CVSS score for CVE-2021-1879?

CVE-2021-1879 has a CVSS score of 6.1 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

How do I patch CVE-2021-1879?

Patch guidance is available from apple security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-1879.

CVE-2021-1879 - remediation guidance & executive summary

Q: Which products are affected by CVE-2021-1879?

4 products: apple ipados, apple iphone os, apple iphone os, apple watchos.

Description

This issue was addressed by improved management of object lifetimes. This issue is fixed in iOS 12.5.2, iOS 14.4.2 and iPadOS 14.4.2, watchOS 7.3.3. 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..

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector: network
Complexity: low
Privileges: none
User Action: required
Scope: changed
Confidentiality: low
Integrity: low
Availability: none
Weaknesses: CWE-79 · Cross-site Scripting (XSS)CWE-79 · Cross-site Scripting (XSS)

Metadata

Primary Vendor: APPLE
Published: 4/2/2021
Last Modified: 10/23/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2021-1879

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary