High 7.8Known exploited (CISA KEV)Published Aug 24, 2021

CVE-2021-30900An out-of-bounds write issue was addressed with improved bounds checking.

Updated under an hour ago (Oct 28, 2026, 3:40 AM ET)

Does this affect you?

It affects Apple iOS and iPadOS and 3 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Mar 30, 2023; federal agencies had to remediate by Apr 20, 2023. Treat that date as your deadline.

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Every CVE for Apple iOS and iPadOS

Exploited in the last 30 days

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.

CVSS: 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-787
Known exploited: Added to CISA KEV Mar 30, 2023; federal remediation due Apr 20, 2023Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 5.20% (percentile 92)
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 15.1	CNA record
apple ipados apple:ipados	before 14.8.1; 15.0	NVD
apple iphone_os apple:iphone_os	before 14.8.1; 15.0	NVD
apple macos apple:macos	before 11.6.1	NVD

References

References

https://support.apple.com/kb/HT212872	x-refsource-confirm, vendor-advisory
https://support.apple.com/en-us/HT212867	x-refsource-misc, vendor-advisory
https://support.apple.com/en-us/HT212868	x-refsource-misc, vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30900	us-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.