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TI-2021-11316 Aliases CVE-2021-30949

Out-of-bounds write in Apple watchOS

Priority LOW 38CWE-787Published · 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-787 and the CVSS impact.

Summary

A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.6.2, tvOS 15.2, macOS Monterey 12.1, Security Update 2021-008 Catalina, iOS 15.2 and iPadOS 15.2, watchOS 8.3. A malicious application may be able to execute arbitrary code with kernel privileges.

Why it matters now

EPSS 0.02075 81st percentileScored 2026-11-07
Fix Fixed watchOS (Apple): 8.3iOS and iPadOS (Apple): 15.2+1 more product

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
ApplewatchOSbefore 8.38.3Patch availableCNA
AppleiOS and iPadOSbefore 15.215.2Patch availableCNA
ApplemacOSbefore 12.112.1Patch availableCNA
ApplemacOSbefore 11.611.6Patch availableCNA
ApplemacOSbefore 15.215.2Patch availableCNA
ApplemacOSbefore 20212021Patch availableCNA
  • watchOS VendorApple Affected before 8.3 Fixed in 8.3 Patch available CNA
  • iOS and iPadOS VendorApple Affected before 15.2 Fixed in 15.2 Patch available CNA
  • macOS VendorApple Affected before 12.1 Fixed in 12.1 Patch available CNA
  • macOS VendorApple Affected before 11.6 Fixed in 11.6 Patch available CNA
  • macOS VendorApple Affected before 15.2 Fixed in 15.2 Patch available CNA
  • macOS VendorApple Affected before 2021 Fixed in 2021 Patch available CNA

CPE configurations NVD · 15

CPEVersionsRoleVendor
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*before 15.2VulnerableApple
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*before 15.2VulnerableApple
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*10.15 – 10.15.7VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:*10.15.7VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:*10.15.7 security_update_2020-001VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:*10.15.7 security_update_2021-001VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:*10.15.7 security_update_2021-002VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:*10.15.7 security_update_2021-003VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-004:*:*:*:*:*:*10.15.7 security_update_2021-004VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-005:*:*:*:*:*:*10.15.7 security_update_2021-005VulnerableApple
  • cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* Versions before 15.2 Vulnerable ·Apple
  • cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* Versions before 15.2 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* Versions 10.15 – 10.15.7 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:* Versions 10.15.7 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:* Versions 10.15.7 security_update_2020-001 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:* Versions 10.15.7 security_update_2021-001 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:* Versions 10.15.7 security_update_2021-002 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:* Versions 10.15.7 security_update_2021-003 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-004:*:*:*:*:*:* Versions 10.15.7 security_update_2021-004 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-005:*:*:*:*:*:* Versions 10.15.7 security_update_2021-005 Vulnerable ·Apple
Show 5 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-006:*:*:*:*:*:*10.15.7 security_update_2021-006VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-007:*:*:*:*:*:*10.15.7 security_update_2021-007VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:supplemental_update:*:*:*:*:*:*10.15.7 supplemental_updateVulnerableApple
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*11.0 to before 11.6.2; 12.0 to before 12.1VulnerableApple
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*before 8.3VulnerableApple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-006:*:*:*:*:*:* Versions 10.15.7 security_update_2021-006 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-007:*:*:*:*:*:* Versions 10.15.7 security_update_2021-007 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:supplemental_update:*:*:*:*:*:* Versions 10.15.7 supplemental_update Vulnerable ·Apple
  • cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions 11.0 to before 11.6.2; 12.0 to before 12.1 Vulnerable ·Apple
  • cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* Versions before 8.3 Vulnerable ·Apple

Remediation

  • Fix · CNA watchOS (Apple) Fixed in 8.3
  • Fix · CNA iOS and iPadOS (Apple) Fixed in 15.2
  • Fix · CNA macOS (Apple) Fixed in 12.1
  • Fix · CNA macOS (Apple) Fixed in 11.6
  • Fix · CNA macOS (Apple) Fixed in 15.2
  • Fix · CNA macOS (Apple) Fixed in 2021

Fixed in the same release

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

  • Release ·

    Apple macOS 11.6

    72 records Highest priority Priority CRITICAL 4 CRITICAL, 5 MEDIUM, 63 LOW

    Other records, highest priority first

    • TI-2021-11230 Use after free in Apple macOSPriority CRITICAL 97
    • TI-2021-11253 Out-of-bounds write in Apple iOS and iPadOSPriority CRITICAL 93
    • TI-2021-11232 Integer overflow in Apple macOSPriority CRITICAL 93
    Show all 72 records →
  • Release ·

    Apple macOS 2021

    55 records Highest priority Priority CRITICAL 2 CRITICAL, 3 MEDIUM, 50 LOW

    Other records, highest priority first

    • TI-2021-11241 Type confusion in Apple iOS and iPadOSPriority CRITICAL 93
    • TI-2021-11373 Deserialization of untrusted data in Apple macOSPriority CRITICAL 90
    • TI-2021-11304 Out-of-bounds write in Apple watchOSPriority MEDIUM 51
    Show all 55 records →
Show 4 more groups
  • Release ·

    Apple macOS 12.1

    40 records Highest priority Priority MEDIUM 6 MEDIUM, 34 LOW

    Other records, highest priority first

    • TI-2021-11304 Out-of-bounds write in Apple watchOSPriority MEDIUM 51
    • TI-2021-11372 Apple iOS and iPadOS: Multiple issues in HDF5Priority MEDIUM 44
    • TI-2021-11341 Incorrect authorization in Apple macOSPriority MEDIUM 41
    Show all 40 records →
  • Release ·

    Apple iOS and iPadOS 15.2

    38 records Highest priority Priority CRITICAL 1 CRITICAL, 4 MEDIUM, 33 LOW

    Other records, highest priority first

    • TI-2021-11348 Buffer overflow in Apple iOS and iPadOSPriority CRITICAL 93
    • TI-2021-11304 Out-of-bounds write in Apple watchOSPriority MEDIUM 51
    • TI-2021-11372 Apple iOS and iPadOS: Multiple issues in HDF5Priority MEDIUM 44
    Show all 38 records →
  • Release ·

    Apple watchOS 8.3

    22 records Highest priority Priority MEDIUM 3 MEDIUM, 19 LOW

    Other records, highest priority first

    • TI-2021-11304 Out-of-bounds write in Apple watchOSPriority MEDIUM 51
    • TI-2021-11306 Out-of-bounds read in Apple watchOSPriority MEDIUM 41
    • TI-2021-11357 Buffer overflow in Apple watchOSPriority MEDIUM 40
    Show all 22 records →
  • Release ·

    Apple macOS 15.2

    18 records Highest priority Priority MEDIUM 3 MEDIUM, 15 LOW

    Other records, highest priority first

    • TI-2021-11304 Out-of-bounds write in Apple watchOSPriority MEDIUM 51
    • TI-2021-11306 Out-of-bounds read in Apple watchOSPriority MEDIUM 41
    • TI-2021-11357 Buffer overflow in Apple watchOSPriority MEDIUM 40
    Show all 18 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-30949

References

Other 7

  • 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