Use after free in Apple watchOS
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
- Partial Red Hat: 3 fixed, 2 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. 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 Big Sur 11.0.1, watchOS 7.1, iOS 14.2 and iPadOS 14.2, iCloud for Windows 11.5, Safari 14.0.1, tvOS 14.2, iTunes 12.11 for Windows. Processing maliciously crafted web content may lead to arbitrary code execution.
Why it matters now
EPSS 0.01425 73rd percentileScored 2026-11-07
Fix Partial watchOS (Apple): 7.1iOS and iPadOS (Apple): 14.2+2 more productsRed Hat: 2 advisoriesRed Hat: 3 fixed, 2 without a fix
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 |
| Apple | macOS | before 12.11 | 12.11 | Patch available | CNA |
| Apple | macOS | before 14.0 | 14.0 | Patch available | CNA |
| Apple | macOS | before 11.5 | 11.5 | Patch available | CNA |
| Apple | macOS | before 11.5 | 11.5 | 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
- macOS VendorApple Affected before 12.11 Fixed in 12.11 Patch available CNA
- macOS VendorApple Affected before 14.0 Fixed in 14.0 Patch available CNA
- macOS VendorApple Affected before 11.5 Fixed in 11.5 Patch available CNA
- macOS VendorApple Affected before 11.5 Fixed in 11.5 Patch available CNA
CPE configurations NVD · 13
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apple:icloud:*:*:*:*:*:windows:*:* | before 11.5 | Vulnerable | Apple |
| cpe:2.3:a:apple:itunes:*:*:*:*:*:windows:*:* | before 12.11 | Vulnerable | Apple |
| cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:* | before 14.0.1 | Vulnerable | Apple |
| 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:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | 33 | Vulnerable | Fedoraproject |
- cpe:2.3:a:apple:icloud:*:*:*:*:*:windows:*:* Versions before 11.5 Vulnerable ·Apple
- cpe:2.3:a:apple:itunes:*:*:*:*:*:windows:*:* Versions before 12.11 Vulnerable ·Apple
- cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:* Versions before 14.0.1 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
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
Show 3 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 34 | Vulnerable | Fedoraproject |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:a:webkitgtk:webkitgtk\+:*:*:*:*:*:*:*:* | before 2.30.6 | Vulnerable | WebKitGTK |
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:a:webkitgtk:webkitgtk\+:*:*:*:*:*:*:*:* Versions before 2.30.6 Vulnerable ·WebKitGTK
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
- Fix · CNA macOS (Apple) Fixed in 12.11
- Fix · CNA macOS (Apple) Fixed in 14.0
- Fix · CNA macOS (Apple) Fixed in 11.5
- Fix · CNA macOS (Apple) Fixed in 11.5
Red Hat 2 advisories
- RHSA-2025:10364 Released 2025-07-07 · Red Hat rating Importantwebkitgtk4 security update
- Red Hat Enterprise Linux Server (v. 7 ELS) webkitgtk4-2.48.3-2.el7_9, webkitgtk4-devel-2.48.3-2.el7_9, webkitgtk4-jsc-2.48.3-2.el7_9 +1
- Red Hat Enterprise Linux Server Optional (v. 7 ELS) webkitgtk4-devel-2.48.3-2.el7_9, webkitgtk4-doc-2.48.3-2.el7_9, webkitgtk4-jsc-devel-2.48.3-2.el7_9
- RHSA-2021:4381 Released 2021-11-09 · Red Hat rating ModerateGNOME security, bug fix, and enhancement update
- Red Hat CodeReady Linux Builder (v. 8) LibRaw-devel-0.19.5-3.el8
- Red Hat Enterprise Linux AppStream (v. 8) LibRaw-0.19.5-3.el8, gnome-autoar-0.2.3-2.el8, webkit2gtk3-2.32.3-2.el8 +3
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
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
- Release ·
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 5 more groups
- Release ·
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
- Release ·
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
- Release ·
Apple macOS 11.5
7 records Highest priority Priority MEDIUM 1 MEDIUM, 6 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
- Release ·
Apple macOS 14.0
5 records Highest priority Priority LOW 5 LOW
Other records, highest priority first
- TI-2020-08051 Use after free in Apple tvOSPriority LOW 37
- TI-2020-08026 Buffer overflow in Apple tvOSPriority LOW 37
- TI-2020-08022 Use after free in Apple macOSPriority LOW 37
- Release ·
Apple macOS 12.11
5 records Highest priority Priority MEDIUM 1 MEDIUM, 4 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
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2021:4381 |
| Red Hat Enterprise Linux Server (v. 7 ELS) | Fixed | RHSA-2025:10364 |
| Red Hat Enterprise Linux Server Optional (v. 7 ELS) | Fixed | RHSA-2025:10364 |
Not affected: 4 products
- Red Hat CodeReady Linux Builder (v. 8)
- Red Hat Enterprise Linux 9
- Red Hat Enterprise Linux AppStream (v. 8)
- Red Hat Enterprise Linux BaseOS (v. 8)
Timeline
- 2026-10-02 Threatist record created from CVE-2020-27918
- 2026-10-03 Alias added: GHSA-w4gf-42f5-463m
References
Advisory 14
- https://support.apple.com/en-us/HT211931
- https://support.apple.com/en-us/HT211935
- https://support.apple.com/en-us/HT211934
- https://support.apple.com/en-us/HT211928
- https://support.apple.com/en-us/HT211929
- https://support.apple.com/en-us/HT211930
- https://support.apple.com/en-us/HT211933
- 20201215 APPLE-SA-2020-12-14-4 Additional information for APPLE-SA-2020-11-13-1 macOS Big Sur 11.0.1
- [oss-security] 20210322 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0002
- FEDORA-2021-8070916f7a
- DSA-4877
- FEDORA-2021-864dc37032
- FEDORA-2021-619711d709
- GLSA-202104-03
More Apple Icloud vulnerabilities
- TI-2019-06084 Type confusion in Apple iOS KEVCVSS 3.1HIGH 8.8
- TI-2020-16987 Type confusion in Apple watchOS KEVCVSS 3.1HIGH 7.8
- TI-2020-07926 Apple iOS: A remote attacker may be able to cause arbitrary code execution CVSS 3.1CRITICAL 9.8
- TI-2018-03187 Memory corruption in Apple WebKit CVSS 3.1HIGH 8.8
- TI-2018-03118 Memory corruption in Apple WebKit CVSS 3.0HIGH 8.8
- TI-2018-03361 Memory corruption in iOS, tvOS, watchOS, Safari, iTunes for Windows, iCloud for Windows CVSS 3.0HIGH 8.8
Sources
- CVE-2020-27918 · CVE Program
- CVE-2020-27918 · NVD
- FIRST EPSS
- GHSA-w4gf-42f5-463m · GitHub Advisory Database · CC BY 4.0
- CVE-2020-27918 · Red Hat security data · CC BY 4.0
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