CVE-2021-30900
Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability
Apple iOS, iPadOS, and macOS
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.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 30 March 2023. US federal agencies were required to remediate it by 20 April 2023.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 5.2%, which is higher than 92.6% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Frequently asked questions
Is CVE-2021-30900 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2021-30900.
What does CVE-2021-30900 affect?
CVE-2021-30900 affects Apple iOS, iPadOS, and macOS. 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.
How severe is CVE-2021-30900?
CVE-2021-30900 is rated HIGH with a CVSS base score of 7.8. EPSS puts the probability of exploitation in the next 30 days at 5.2%, higher than 92.6% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 20 April 2023.
How should organisations respond to CVE-2021-30900?
Apply the vendor patch for Apple iOS, iPadOS, and macOS as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.