CVE-2021-30807
Memory Safety in Apple Ipados ≤ 14.7.1
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-2021-30807 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 2% 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.
A memory corruption vulnerability, tracked as CVE-2021-30807 and assigned CWE-787, affects multiple Apple platforms due to insufficient memory handling. The flaw impacts macOS Big Sur prior to version 11.5.1, iOS and iPadOS prior to 14.7.1, and watchOS prior to 7.6.1, with a CVSS v3.1 base score of 7.8 reflecting local attack vector, low complexity, and no required privileges.
An unauthenticated local attacker can exploit the issue by convincing a user to run a malicious application, resulting in arbitrary code execution with kernel-level privileges on the affected device. The attack requires user interaction but does not need elevated permissions beforehand.
Apple security advisories for the listed platform updates state that the issue has been resolved through improved memory handling in the patched releases. The references point to official support documents detailing the affected versions and corresponding fixes.
Apple has indicated awareness of reports that this vulnerability may have been actively exploited in the wild prior to patching.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-17724
Vulnerability Data
A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.5.1, iOS 14.7.1 and iPadOS 14.7.1, watchOS 7.6.1. An application may be able to execute arbitrary code with kernel privileges. Apple is…
more
aware of a report that this issue may have been actively exploited.
- CWE(s)
- KEV Date Added
- 03 November 2021
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.