CVE-2021-30860 — Apple Multiple Products Integer Overflow Vulnerability

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

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
Apple	macOS	unspecified
Apple	macOS	unspecified
Apple	watchOS	unspecified
Apple	iOS	unspecified

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2021-11-03. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2021-08-24T18:49:25.000Z
• Last modified: 2025-10-21T23:25:37.148Z
• Added to CISA KEV: 2021-11-03
• BOD 22-01 due: 2021-11-17

09References

• support.apple.com — https://support.apple.com/en-us/HT212804
• support.apple.com — https://support.apple.com/en-us/HT212805
• support.apple.com — https://support.apple.com/en-us/HT212807
• support.apple.com — https://support.apple.com/en-us/HT212806
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/28
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/27
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/25
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/26
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/40
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/38
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/39
• support.apple.com — https://support.apple.com/kb/HT212824
• seclists.org — http://seclists.org/fulldisclosure/2021/Sep/50
• www.openwall.com — http://www.openwall.com/lists/oss-security/2022/09/02/11
• security.gentoo.org — https://security.gentoo.org/glsa/202209-21