CVE-2021-30791

Name: CVE-2021-30791
Creator: NVD / NIST
Published: 2021-09-08T14:15:11.487+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 1.08%

Last modified Jun 17, 2026

CVE-2021-30791 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in iOS 14.7, macOS Big Sur 11.5. EPSS estimates a 1.08% chance of exploitation in the next 30 days.

Description

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in iOS 14.7, macOS Big Sur 11.5. Processing a maliciously crafted file may disclose user information.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

1.08%

60.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 14.7
Apple	Iphone Os	< 14.7
Apple	Mac Os X	>= 10.14.0, < 10.14.6
Apple	Mac Os X	>= 10.15, < 10.15.7
Apple	Mac Os X	10.14.6
Apple	Mac Os X	10.15.7
Apple	Macos	< 11.5

References

https://support.apple.com/en-us/HT212601Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212602Release Notes, Vendor Advisory
https://support.apple.com/kb/HT212600Vendor Advisory
https://support.apple.com/kb/HT212603Vendor Advisory
https://support.apple.com/en-us/HT212601Release Notes, Vendor Advisory
https://support.apple.com/en-us/HT212602Release Notes, Vendor Advisory
https://support.apple.com/kb/HT212600Vendor Advisory
https://support.apple.com/kb/HT212603Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-30791?

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in iOS 14.7, macOS Big Sur 11.5. Processing a maliciously crafted file may disclose user information.

How severe is CVE-2021-30791?

CVE-2021-30791 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 1.08% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30791?

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-2021-30791?

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

Scan your code now

Source: NVD / NIST