CVE-2021-31010
KEVApple iOS, macOS, watchOS Sandbox Bypass Vulnerability
Description
In affected versions of Apple iOS, macOS, and watchOS, a sandboxed process may be able to circumvent sandbox restrictions.
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 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NPublishedAug 24, 2021
Last modifiedJun 17, 2026
Added to KEVAug 25, 2022
Remediation dueSep 15, 2022
References
- support.apple.com/en-us/HT212804Vendor Advisory
- support.apple.com/en-us/HT212805Vendor Advisory
- support.apple.com/en-us/HT212806Vendor Advisory
- support.apple.com/en-us/HT212807Vendor Advisory
- support.apple.com/en-us/HT212824Vendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31010US Government Resource
0 recent articles mention this CVE
68
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1502 days
- CVSS
- 7.5 HIGH
- EPSS (30-day exploit probability)
- 3.7% · top 10% of all CVEs
- Weakness
- CWE-502
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.