TI-2020-16983 Aliases CVE-2020-27927 GHSA-m694-ffqc-42hh

Out-of-bounds write in Apple watchOS

LOW 37CWE-787Published 2020-12-08 · Updated 2024-08-04

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

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Big Sur 11.0.1, iOS 14.2 and iPadOS 14.2, tvOS 14.2, watchOS 7.1. Processing a maliciously crafted font file may lead to arbitrary code execution.

Why it matters now

EPSS 0.01262 69th percentileScored 2026-11-07

Fix Fixed watchOS (Apple): 7.1iOS and iPadOS (Apple): 14.2+2 more products

SSVC decision points

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Apple	watchOS	before 7.1	7.1	Patch available	CNA
Apple	iOS and iPadOS	before 14.2	14.2	Patch available	CNA
Apple	tvOS	before 14.2	14.2	Patch available	CNA
Apple	macOS	before 11.0	11.0	Patch available	CNA

watchOS VendorApple Affected before 7.1 Fixed in 7.1 Patch available CNA
iOS and iPadOS VendorApple Affected before 14.2 Fixed in 14.2 Patch available CNA
tvOS VendorApple Affected before 14.2 Fixed in 14.2 Patch available CNA
macOS VendorApple Affected before 11.0 Fixed in 11.0 Patch available CNA

CPE configurations NVD · 5

CPE	Versions	Role	Vendor
cpe:2.3:o:apple:ipados::::::::	before 14.2	Vulnerable	Apple
cpe:2.3:o:apple:iphone_os::::::::	before 14.2	Vulnerable	Apple
cpe:2.3:o:apple:macos::::::::	before 11.0.1	Vulnerable	Apple
cpe:2.3:o:apple:tvos::::::::	before 14.2	Vulnerable	Apple
cpe:2.3:o:apple:watchos::::::::	before 7.1	Vulnerable	Apple

cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* Versions before 14.2 Vulnerable ·Apple
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* Versions before 14.2 Vulnerable ·Apple
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions before 11.0.1 Vulnerable ·Apple
cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* Versions before 14.2 Vulnerable ·Apple
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* Versions before 7.1 Vulnerable ·Apple

Remediation

Fix · CNA watchOS (Apple) Fixed in 7.1
Fix · CNA iOS and iPadOS (Apple) Fixed in 14.2
Fix · CNA tvOS (Apple) Fixed in 14.2
Fix · CNA macOS (Apple) Fixed in 11.0

Fixed in the same release

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

Release · 2020-12-08
Apple macOS 11.0
45 records Highest priority Priority CRITICAL 2 CRITICAL, 1 HIGH, 4 MEDIUM, 38 LOW
Other records, highest priority first
- TI-2020-16987 Type confusion in Apple watchOSPriority CRITICAL 93
- TI-2020-16985 Out-of-bounds write in Apple watchOSPriority CRITICAL 93
- TI-2020-17004 Apple watchOS: A malicious application may be able to disclose kernel memoryPriority HIGH 82
Show all 45 records →
Release · 2020-12-08
Apple iOS and iPadOS 14.2
22 records Highest priority Priority CRITICAL 2 CRITICAL, 1 HIGH, 1 MEDIUM, 18 LOW
Other records, highest priority first
- TI-2020-16987 Type confusion in Apple watchOSPriority CRITICAL 93
- TI-2020-16985 Out-of-bounds write in Apple watchOSPriority CRITICAL 93
- TI-2020-17004 Apple watchOS: A malicious application may be able to disclose kernel memoryPriority HIGH 82
Show all 22 records →

Show 2 more groups

Release · 2020-12-08
Apple watchOS 7.1
18 records Highest priority Priority CRITICAL 2 CRITICAL, 1 HIGH, 1 MEDIUM, 14 LOW
Other records, highest priority first
- TI-2020-16987 Type confusion in Apple watchOSPriority CRITICAL 93
- TI-2020-16985 Out-of-bounds write in Apple watchOSPriority CRITICAL 93
- TI-2020-17004 Apple watchOS: A malicious application may be able to disclose kernel memoryPriority HIGH 82
Show all 18 records →
Release · 2020-12-08
Apple tvOS 14.2
15 records Highest priority Priority MEDIUM 1 MEDIUM, 14 LOW
Other records, highest priority first
- TI-2020-16968 Integer overflow in Apple watchOSPriority MEDIUM 40
- TI-2020-16973 Use after free in Apple watchOSPriority LOW 38
- TI-2020-16969 Out-of-bounds write in Apple watchOSPriority LOW 38
Show all 15 records →

Timeline

2026-10-02 Threatist record created from CVE-2020-27927
2026-10-03 Alias added: GHSA-m694-ffqc-42hh

References

Advisory 5

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