High 8.8Known exploited (CISA KEV)Published Aug 24, 2021

CVE-2021-30952An integer overflow was addressed with improved input validation.

Updated under an hour ago (Oct 26, 2026, 11:10 PM ET)

Does this affect you?

It affects Apple watchOS and 10 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Mar 5, 2026; federal agencies had to remediate by Mar 26, 2026. Treat that date as your deadline.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Apple watchOS

Exploited in the last 30 days

An integer overflow was addressed with improved input validation. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.

CVSS: 8.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-190
Known exploited: Added to CISA KEV Mar 5, 2026; federal remediation due Mar 26, 2026Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 6.96% (percentile 94)
Assigned by: apple
NVD analysis: Analyzed
Record last updated: Mar 6, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apple watchOS apple:watchos (from the name)	from unspecified before 8.3	CNA record
Apple iOS and iPadOS apple:ios_and_ipados (from the name)	from unspecified before 15.2	CNA record
Apple macOS apple:macos (from the name)	from unspecified before 12.1	CNA record
apple safari apple:safari	before 15.2	NVD
apple ipados apple:ipados	before 15.2	NVD
apple iphone_os apple:iphone_os	before 15.2	NVD
apple macos apple:macos	from 12.0 before 12.1	NVD
apple tvos apple:tvos	before 15.2	NVD
apple watchos apple:watchos	before 8.3	NVD
fedoraproject fedora fedoraproject:fedora	34; 35	NVD
1–10 of 13

References

References

https://support.apple.com/en-us/HT212975	x-refsource-misc, release-notes, vendor-advisory
https://support.apple.com/en-us/HT212976	x-refsource-misc, release-notes, vendor-advisory
https://support.apple.com/en-us/HT212978	x-refsource-misc, release-notes, vendor-advisory
https://support.apple.com/en-us/HT212980	x-refsource-misc, release-notes, vendor-advisory
https://support.apple.com/en-us/HT212982	x-refsource-misc, release-notes, vendor-advisory
http://www.openwall.com/lists/oss-security/2022/01/21/2	mailing-list, x-refsource-mlist, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/	vendor-advisory, x-refsource-fedora, broken-link
https://www.debian.org/security/2022/dsa-5061	vendor-advisory, x-refsource-debian, mailing-list, third-party-advisory
https://www.debian.org/security/2022/dsa-5060	vendor-advisory, x-refsource-debian, mailing-list, third-party-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/	vendor-advisory, x-refsource-fedora, broken-link
1–10 of 12

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.