CVE-2021-30799

Name: CVE-2021-30799
Creator: NVD / NIST
Published: 2021-09-08T14:15:11.793+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.09%

Last modified Jun 17, 2026

CVE-2021-30799 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Multiple memory corruption issues were addressed with improved memory handling. This issue is fixed in iOS 14.7, macOS Big Sur 11.5, Security Update 2021-004 Catalina, Security Update 2021-005 Mojave. EPSS estimates a 2.09% chance of exploitation in the next 30 days.

Description

Multiple memory corruption issues were addressed with improved memory handling. This issue is fixed in iOS 14.7, macOS Big Sur 11.5, Security Update 2021-004 Catalina, Security Update 2021-005 Mojave. Processing maliciously crafted web content may lead to arbitrary code execution.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

2.09%

79.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions	Update
Apple	Iphone Os	< 14.7	—
Apple	Mac Os X	>= 10.14, <= 10.14.6	—
Apple	Mac Os X	>= 10.15, < 10.15.7	—
Apple	Mac Os X	10.14.6	Security Update 2019-001
Apple	Mac Os X	10.15.6	Supplemental Update
Apple	Mac Os X	10.15.7	Security Update 2020
Apple	Macos	>= 11.0, < 11.5	—

References

https://support.apple.com/en-us/HT212600Vendor Advisory
https://support.apple.com/en-us/HT212601Vendor Advisory
https://support.apple.com/en-us/HT212602Vendor Advisory
https://support.apple.com/en-us/HT212603Vendor Advisory
https://support.apple.com/en-us/HT212600Vendor Advisory
https://support.apple.com/en-us/HT212601Vendor Advisory
https://support.apple.com/en-us/HT212602Vendor Advisory
https://support.apple.com/en-us/HT212603Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-30799?

How severe is CVE-2021-30799?

CVE-2021-30799 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.09% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30799?

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-2021-30799?

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

Scan your code now

Source: NVD / NIST