Raw vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2021-30900 is a high-severity Out-of-bounds Write (CWE-787) vulnerability in Apple Ipados. Its CVSS base score is 7.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Security Account Manager (T1003.002); ranked in the top 8% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
An out-of-bounds write vulnerability, tracked as CVE-2021-30900 and assigned CWE-787, affects iOS and iPadOS. The flaw stems from insufficient bounds checking and received a CVSS v3.1 score of 7.8. It is resolved in iOS 14.8.1, iPadOS 14.8.1, iOS 15.1, and iPadOS 15.1.
A malicious application running on an affected device can trigger the issue to perform an out-of-bounds write. Successful exploitation grants the attacker the ability to execute arbitrary code with kernel privileges. The attack requires local access, no prior privileges, and some user interaction.
Apple security advisories direct users to install the listed updates, which incorporate improved bounds checking to eliminate the flaw. The referenced support documents detail the affected builds and corresponding patched releases for both iOS and iPadOS.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-17817
Vulnerability Data
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.
- CWE(s)
- KEV Date Added
- 30 March 2023
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Vulnerability scanning and recording can discover out-of-bounds write flaws so they can be remediated.
Patching or replacing vulnerable software directly eliminates known instances of this coding weakness.
Secure-development practices (static analysis, bounds checking, code review) are the primary means of preventing out-of-bounds writes.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.