CVE-2021-31010

Name: CVE-2021-31010
Creator: NVD / NIST
Published: 2021-08-24T19:15:24.967+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10Actively ExploitedEPSS 3.67%

Last modified Jun 17, 2026

CVE-2021-31010 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 3.67% chance of exploitation in the next 30 days.

Description

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..

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

3.67%

88.3th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Sep 15, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 14.8
Apple	Iphone Os	>= 12.0, < 12.5.5
Apple	Iphone Os	>= 14.0, < 14.8
Apple	Mac Os X	>= 10.15, < 10.15.7
Apple	Mac Os X	10.15.7
Apple	Macos	>= 11.0, < 11.6
Apple	Watchos	< 7.6.2

References

https://support.apple.com/en-us/HT212804Vendor Advisory
https://support.apple.com/en-us/HT212805Vendor Advisory
https://support.apple.com/en-us/HT212806Vendor Advisory
https://support.apple.com/en-us/HT212807Vendor Advisory
https://support.apple.com/en-us/HT212824Vendor Advisory
https://support.apple.com/en-us/HT212804Vendor Advisory
https://support.apple.com/en-us/HT212805Vendor Advisory
https://support.apple.com/en-us/HT212806Vendor Advisory
https://support.apple.com/en-us/HT212807Vendor Advisory
https://support.apple.com/en-us/HT212824Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31010US Government Resource

Timeline

Published: Aug 24, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-31010?

How severe is CVE-2021-31010?

CVE-2021-31010 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.67% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-31010?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31010?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST