CVE-2021-30677

Name: CVE-2021-30677
Creator: NVD / NIST
Published: 2021-09-08T15:15:14.123+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2021-30677 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. This issue was addressed with improved environment sanitization. This issue is fixed in tvOS 14.6, iOS 14.6 and iPadOS 14.6, Security Update 2021-004 Catalina, Security Update 2021-005 Mojave, macOS Big Sur 11.4, watchOS 7.5. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

This issue was addressed with improved environment sanitization. This issue is fixed in tvOS 14.6, iOS 14.6 and iPadOS 14.6, Security Update 2021-004 Catalina, Security Update 2021-005 Mojave, macOS Big Sur 11.4, watchOS 7.5. A malicious application may be able to break out of its sandbox.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.34%

25.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 14.6
Apple	Iphone Os	< 14.6
Apple	Mac Os X	>= 10.14, <= 10.14.5
Apple	Mac Os X	>= 10.15, <= 10.15.6
Apple	Mac Os X	10.14.6
Apple	Mac Os X	10.15.7
Apple	Macos	>= 11.0, < 11.4
Apple	Tvos	< 14.6
Apple	Watchos	< 7.5

References

https://support.apple.com/en-us/HT212528Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212529Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212532Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212533Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212600Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212603Release Notes, Vendor Advisory
https://support.apple.com/kb/HT212602Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212528Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212529Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212532Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212533Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212600Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212603Release Notes, Vendor Advisory
https://support.apple.com/kb/HT212602Release Notes, Vendor Advisory

Timeline

Published: Sep 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30677?

How severe is CVE-2021-30677?

CVE-2021-30677 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30677?

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-2021-30677?

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

Scan your code now

Source: NVD / NIST