CVE-2021-30900
Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply updates per vendor instructions.
CISA notes
https://support.apple.com/en-us/HT21286, https://support.apple.com/en-us/HT212868, https://support.apple.com/kb/HT212872; https://nvd.nist.gov/vuln/detail/CVE-2021-30900
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.
Severity
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation Context
as of October 13, 2026- CISA added CVE-2021-30900 to the KEV catalog 583 days after its CVE record was published. The median for entries added in 2023 is 12 days.
- It is one of 95 Apple entries in the CISA KEV catalog, and one of 21 added in 2023.
- Its current EPSS score (5.2%) is higher than that of 18% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Apple | Apple iOS and iPadOS | unspecified to <15.1 |
| Apple | Apple iOS and iPadOS | unspecified to <14.8 |
References
3 LinksRecord Details
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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.