CVE-2021-30900
Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability
- High 7.8
- Exploited: added to CISA KEV 30 Mar 2023
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.
Key facts
- Published
- 24 Aug 2021
- Last changed
- 21 Oct 2025
- Assigned by
- apple
- KEV added
- 30 Mar 2023
- KEV fix due
- 20 Apr 2023
- EPSS
- 5.204% likely to be exploited in the next 30 days, higher than 92.616% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 7.8CVSS 3.1, Highfrom CISA (ADP container)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Apple | iOS and iPadOS |
|
| Apple | iOS and iPadOS |
|
Timeline
- 24 Aug 2021 Published
- 30 Mar 2023 CVE-2021-30900 added to CISA KEV
- 30 Mar 2023 Added to the CISA KEV catalogue