CVE-2021-30900

Name: CVE-2021-30900
Creator: NVD / NIST
Published: 2021-08-24T19:15:18.083+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10Actively ExploitedEPSS 5.20%

Last modified Jun 17, 2026

CVE-2021-30900 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. CISA has confirmed active exploitation in the wild. EPSS estimates a 5.20% chance of exploitation in the next 30 days.

Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

5.20%

91.4th 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 Apr 20, 2023.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apple	Ipados	< 14.8.1
Apple	Ipados	15.0
Apple	Iphone Os	< 14.8.1
Apple	Iphone Os	15.0
Apple	Macos	< 11.6.1

References

https://support.apple.com/en-us/HT212867Vendor Advisory
https://support.apple.com/en-us/HT212868Vendor Advisory
https://support.apple.com/kb/HT212872Vendor Advisory
https://support.apple.com/en-us/HT212867Vendor Advisory
https://support.apple.com/en-us/HT212868Vendor Advisory
https://support.apple.com/kb/HT212872Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30900US Government Resource

Timeline

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

Frequently Asked Questions

What is CVE-2021-30900?

How severe is CVE-2021-30900?

CVE-2021-30900 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 5.20% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-30900?

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-2021-30900?

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

Scan your code now

Source: NVD / NIST