Medium 6.1Known exploited (CISA KEV)Published Apr 2, 2021

CVE-2021-1879This issue was addressed by improved management of object lifetimes.

Updated under an hour ago (2026-10-19 11:10 UTC)

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It affects Apple iOS and iPadOS and 4 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by Nov 17, 2021. Treat that date as your deadline.

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Exploited in the last 30 days

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: 6.1 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Added to CISA KEV Nov 3, 2021; federal remediation due Nov 17, 2021Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 7.08% (percentile 94)
Assigned by: apple
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apple iOS and iPadOS apple:ios_and_ipados (from the name)	from unspecified before 14.4	CNA record
Apple iOS apple:ios (from the name)	from unspecified before 12.5	CNA record
Apple watchOS apple:watchos (from the name)	from unspecified before 7.3	CNA record
apple ipados apple:ipados	before 14.4.2	NVD
apple iphone_os apple:iphone_os	before 12.5.2; from 13.0 before 14.4.2	NVD
apple watchos apple:watchos	before 7.3.3	NVD

References

https://support.apple.com/en-us/HT212256x-refsource-misc, release-notes, vendor-advisory
https://support.apple.com/en-us/HT212257x-refsource-misc, release-notes, vendor-advisory
https://support.apple.com/en-us/HT212258x-refsource-misc, release-notes, vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1879us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.