CVE-2021-1879

Apple iOS and iPadOS, Apple iOS, Apple watchOS

Published 2 Apr 2021 · updated 17 Jun 2026 · Analyzed

6.1 Medium · CVSS 3.1, NVD

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, with a remediation deadline of 17 Nov 2021 for US federal agencies.

Required action: Apply updates per vendor instructions.

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..

References

support.apple.com/en-us/HT212256 · Release Notes, Vendor Advisory
support.apple.com/en-us/HT212257 · Release Notes, Vendor Advisory
support.apple.com/en-us/HT212258 · Release Notes, Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1879 · US Government Resource