High 7.5Known exploited (CISA KEV)Published Aug 24, 2021

CVE-2021-31010A deserialization issue was addressed through improved validation.

Updated under an hour ago (Oct 27, 2026, 12:40 AM ET)

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It affects Apple macOS and 4 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Aug 25, 2022; federal agencies had to remediate by Sep 15, 2022. Treat that date as your deadline.

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Exploited in the last 30 days

A deserialization issue was addressed through improved validation. This issue is fixed in Security Update 2021-005 Catalina, iOS 12.5.5, iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6, watchOS 7.6.2. A sandboxed process may be able to circumvent sandbox restrictions. Apple was aware of a report that this issue may have been actively exploited at the time of release..

CVSS: 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-502
Known exploited: Added to CISA KEV Aug 25, 2022; federal remediation due Sep 15, 2022Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 3.67% (percentile 90)
Assigned by: apple
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apple macOS apple:macos (from the name)	from unspecified before 11.6	CNA record
Apple watchOS apple:watchos (from the name)	from unspecified before 7.6	CNA record
apple ipados apple:ipados	before 14.8	NVD
apple iphone_os apple:iphone_os	from 12.0 before 12.5.5; from 14.0 before 14.8	NVD
apple mac_os_x apple:mac_os_x	from 10.15 before 10.15.7; 10.15.7; 10.15.7; 10.15.7; 10.15.7; 10.15.7; 10.15.7; 10.15.7; and 9 more ranges	NVD
apple macos apple:macos	from 11.0 before 11.6	NVD
apple watchos apple:watchos	before 7.6.2	NVD

References

References

https://support.apple.com/en-us/HT212804	x-refsource-misc, vendor-advisory
https://support.apple.com/en-us/HT212805	x-refsource-misc, vendor-advisory
https://support.apple.com/en-us/HT212807	x-refsource-misc, vendor-advisory
https://support.apple.com/en-us/HT212806	x-refsource-misc, vendor-advisory
https://support.apple.com/en-us/HT212824	x-refsource-misc, vendor-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31010	us-government-resource

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.