CVE-2021-30952: Apple watchOS

Integer overflow in Apple watchOS and others

CVSS 8.8 HighCriticalIn CISA KEVEPSS 0.070 · 94th percentile

Critical, because:

In CISA’s KEV catalogue since 5 Mar 2026: it is known to be exploited.

Published by the CVE Program (CNA: apple) at 24 Aug 2021, 18:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Apple	watchOS	affected unspecified to before 8.3 custom
Apple	iOS and iPadOS	affected unspecified to before 15.2 custom
Apple	macOS	affected unspecified to before 12.1 custom
Apple	macOS	affected unspecified to before 15.2 custom
Apple	macOS	affected unspecified to before 15.2 custom

Identifiers

CVE-2021-30952

CNA

apple

Weakness (CWE)

CWE-190

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.8	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	ADP (CISA-ADP)

CISA KEV Listed since 5 Mar 2026: known to be exploited.
EPSS 0.070, the 94th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 24 Aug 2021. New records show when each source confirmed them.

Sources

References from the CNA

support.apple.com/en-us/HT212975
support.apple.com/en-us/HT212976
support.apple.com/en-us/HT212978
support.apple.com/en-us/HT212980
support.apple.com/en-us/HT212982
www.openwall.com/lists/oss-security/2022/01/21/2 mailing-listmlist
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/ vendor-advisoryfedora
www.debian.org/security/2022/dsa-5061 vendor-advisorydebian
www.debian.org/security/2022/dsa-5060 vendor-advisorydebian
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/ vendor-advisoryfedora

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.