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TI-2021-11255 Aliases CVE-2021-30886

Use after free in Apple iOS and iPadOS

Priority LOW 37CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.

Summary

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Monterey 12.0.1, iOS 15.1 and iPadOS 15.1, watchOS 8.1, tvOS 15.1. An application may be able to execute arbitrary code with kernel privileges.

Why it matters now

EPSS 0.0123 69th percentileScored 2026-11-07
Fix Fixed iOS and iPadOS (Apple): 15.1macOS (Apple): 12.0, 8.1, 15.1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
AppleiOS and iPadOSbefore 15.115.1Patch availableCNA
ApplemacOSbefore 12.012.0Patch availableCNA
ApplemacOSbefore 8.18.1Patch availableCNA
ApplemacOSbefore 15.115.1Patch availableCNA
  • iOS and iPadOS VendorApple Affected before 15.1 Fixed in 15.1 Patch available CNA
  • macOS VendorApple Affected before 12.0 Fixed in 12.0 Patch available CNA
  • macOS VendorApple Affected before 8.1 Fixed in 8.1 Patch available CNA
  • macOS VendorApple Affected before 15.1 Fixed in 15.1 Patch available CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*before 15.1VulnerableApple
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*before 15.1VulnerableApple
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*before 12.0.1VulnerableApple
cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*before 15.1VulnerableApple
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*before 8.1VulnerableApple
  • cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* Versions before 15.1 Vulnerable ·Apple
  • cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* Versions before 15.1 Vulnerable ·Apple
  • cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions before 12.0.1 Vulnerable ·Apple
  • cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* Versions before 15.1 Vulnerable ·Apple
  • cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* Versions before 8.1 Vulnerable ·Apple

Remediation

  • Fix · CNA iOS and iPadOS (Apple) Fixed in 15.1
  • Fix · CNA macOS (Apple) Fixed in 12.0
  • Fix · CNA macOS (Apple) Fixed in 8.1
  • Fix · CNA macOS (Apple) Fixed in 15.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Apple macOS 12.0

    45 records Highest priority Priority CRITICAL 1 CRITICAL, 3 MEDIUM, 41 LOW

    Other records, highest priority first

    • TI-2021-11253 Out-of-bounds write in Apple iOS and iPadOSPriority CRITICAL 93
    • TI-2021-11258 Buffer overflow in Apple iOS and iPadOSPriority MEDIUM 42
    • TI-2021-11371 Type confusion in Apple iOS and iPadOSPriority MEDIUM 41
    Show all 45 records →
  • Release ·

    Apple iOS and iPadOS 15.1

    21 records Highest priority Priority CRITICAL 1 CRITICAL, 1 MEDIUM, 19 LOW

    Other records, highest priority first

    • TI-2021-11267 Out-of-bounds write in Apple iOS and iPadOSPriority CRITICAL 93
    • TI-2021-11258 Buffer overflow in Apple iOS and iPadOSPriority MEDIUM 42
    • TI-2021-11286 Out-of-bounds write in Apple iOS and iPadOSPriority LOW 37
    Show all 21 records →
Show 2 more groups
  • Release ·

    Apple macOS 15.1

    15 records Highest priority Priority CRITICAL 1 CRITICAL, 1 MEDIUM, 13 LOW

    Other records, highest priority first

    • TI-2021-11253 Out-of-bounds write in Apple iOS and iPadOSPriority CRITICAL 93
    • TI-2021-11258 Buffer overflow in Apple iOS and iPadOSPriority MEDIUM 42
    • TI-2021-11286 Out-of-bounds write in Apple iOS and iPadOSPriority LOW 37
    Show all 15 records →
  • Release ·

    Apple macOS 8.1

    14 records Highest priority Priority CRITICAL 1 CRITICAL, 1 MEDIUM, 12 LOW

    Other records, highest priority first

    • TI-2021-11253 Out-of-bounds write in Apple iOS and iPadOSPriority CRITICAL 93
    • TI-2021-11258 Buffer overflow in Apple iOS and iPadOSPriority MEDIUM 42
    • TI-2021-11286 Out-of-bounds write in Apple iOS and iPadOSPriority LOW 37
    Show all 14 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-30886

References

Other 4

  • TI-2025-28008 Out-of-bounds write in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-22441 Apple iOS and iPadOS: An attacker with arbitrary read and write capability may be able to… KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-22440 Memory corruption in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-17951 Out-of-bounds write in Apple Safari KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-17847 Use after free in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 10.0
  • TI-2022-06854 Out-of-bounds write in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 9.8
See all 2382 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences