CVE-2021-30860: Apple macOS

Integer overflow in Apple macOS and others

CVSS 7.8 HighCriticalIn CISA KEVEPSS 0.76 · 99th percentile

Critical, because:

In CISA’s KEV catalogue since 3 Nov 2021: it is known to be exploited.
CVSS score 7.8 (7.0 or more) and EPSS 0.76 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

Published by the CVE Program (CNA: apple) at 24 Aug 2021, 18:49 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	macOS	affected unspecified to before 11.6 custom
Apple	macOS	affected unspecified to before 2021-005 custom
Apple	watchOS	affected unspecified to before 7.6 custom
Apple	iOS	affected unspecified to before 14.8 custom

Identifiers

CVE-2021-30860

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
7.8	High	3.1	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	ADP (CISA-ADP)

CISA KEV Listed since 3 Nov 2021: known to be exploited.
EPSS 0.76, the 99th percentile, on 5 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/HT212804
support.apple.com/en-us/HT212805
support.apple.com/en-us/HT212807
support.apple.com/en-us/HT212806
seclists.org/fulldisclosure/2021/Sep/28 mailing-listfulldisc
seclists.org/fulldisclosure/2021/Sep/27 mailing-listfulldisc
seclists.org/fulldisclosure/2021/Sep/25 mailing-listfulldisc
seclists.org/fulldisclosure/2021/Sep/26 mailing-listfulldisc
seclists.org/fulldisclosure/2021/Sep/40 mailing-listfulldisc
seclists.org/fulldisclosure/2021/Sep/38 mailing-listfulldisc
seclists.org/fulldisclosure/2021/Sep/39 mailing-listfulldisc
support.apple.com/kb/HT212824 confirm
seclists.org/fulldisclosure/2021/Sep/50 mailing-listfulldisc
www.openwall.com/lists/oss-security/2022/09/02/11 mailing-listmlist
security.gentoo.org/glsa/202209-21 vendor-advisorygentoo

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.