7.8 High Exploited

CVE-2021-30860 Apple Multiple Products Integer Overflow Vulnerability

Active exploitation observed

· CISA KEV catalogue

Required action Apply updates per vendor instructions.

Ransomware campaigns Not observed so far

Weakness CWE-20, CWE-190

Description

An integer overflow was addressed with improved input validation. This issue is fixed in Security Update 2021-005 Catalina, iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, watchOS 7.6.2. Processing a maliciously crafted PDF may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

Affected products and versions

Product	Affected versions	Fixed in
macOS 2021	earliest → < 2021-005	2021-005
watchOS 7.6	earliest → < 7.6	7.6
iOS 14.8	earliest → < 14.8	14.8

References

support.apple.com support.apple.com
support.apple.com support.apple.com
support.apple.com support.apple.com
support.apple.com support.apple.com
20210917 APPLE-SA-2021-09-13-4 Security Update 2021-005 Catalina seclists.org
20210917 APPLE-SA-2021-09-13-3 macOS Big Sur 11.6 seclists.org
20210917 APPLE-SA-2021-09-13-1 iOS 14.8 and iPadOS 14.8 seclists.org
20210917 APPLE-SA-2021-09-13-2 watchOS 7.6.2 seclists.org
20210921 APPLE-SA-2021-09-20-8 Additional information for APPLE-SA-2021-09-13-4 Security Update 2021-005 Catalina seclists.org
20210921 APPLE-SA-2021-09-20-6 Additional information for APPLE-SA-2021-09-13-1 iOS 14.8 and iPadOS 14.8 seclists.org
20210921 APPLE-SA-2021-09-20-7 Additional information for APPLE-SA-2021-09-13-3 macOS Big Sur 11.6 seclists.org
support.apple.com support.apple.com
20210924 APPLE-SA-2021-09-23-1 iOS 12.5.5 seclists.org
[oss-security] 20220902 JBIG2 integer overflow fixed in Xpdf 4.04, Poppler 22.09.0 www.openwall.com
GLSA-202209-21 security.gentoo.org

Timeline

Published August 24, 2021
Added to the KEV catalogue November 3, 2021
Last modified October 21, 2025

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