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TI-2021-11048 Aliases CVE-2021-30663GHSA-5g93-pf3w-6f59

Integer overflow in Apple macOS

Priority CRITICAL 97Exploited in the wildCWE-190Published · Updated

Key facts

Attack vector
Network
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-190 and the CVSS impact.

Summary

An integer overflow was addressed with improved input validation. This issue is fixed in iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, Safari 14.1.1, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution.

Why it matters now

Exploitation Active In CISA KEV since 2021-11-03CISA due date 2021-11-17
EPSS 0.03521 89th percentileScored 2026-11-07
Fix Partial macOS (Apple): 11.3, 14.5, 12.5 +2Red Hat: 2 advisoriesRed Hat: 3 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApplemacOSbefore 11.311.3Patch availableCNA
ApplemacOSbefore 14.514.5Patch availableCNA
ApplemacOSbefore 12.512.5Patch availableCNA
ApplemacOSbefore 14.614.6Patch availableCNA
ApplemacOSbefore 14.114.1Patch availableCNA
  • macOS VendorApple Affected before 11.3 Fixed in 11.3 Patch available CNA
  • macOS VendorApple Affected before 14.5 Fixed in 14.5 Patch available CNA
  • macOS VendorApple Affected before 12.5 Fixed in 12.5 Patch available CNA
  • macOS VendorApple Affected before 14.6 Fixed in 14.6 Patch available CNA
  • macOS VendorApple Affected before 14.1 Fixed in 14.1 Patch available CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*before 14.1.1VulnerableApple
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*14.0 to before 14.5.1VulnerableApple
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*before 12.5.3; 14.0 to before 14.5.1VulnerableApple
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*11.0 to before 11.3.1VulnerableApple
cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*before 14.6VulnerableApple
  • cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:* Versions before 14.1.1 Vulnerable ·Apple
  • cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* Versions 14.0 to before 14.5.1 Vulnerable ·Apple
  • cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* Versions before 12.5.3; 14.0 to before 14.5.1 Vulnerable ·Apple
  • cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions 11.0 to before 11.3.1 Vulnerable ·Apple
  • cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* Versions before 14.6 Vulnerable ·Apple

Remediation

  • Fix · CNA macOS (Apple) Fixed in 11.3
  • Fix · CNA macOS (Apple) Fixed in 14.5
  • Fix · CNA macOS (Apple) Fixed in 12.5
  • Fix · CNA macOS (Apple) Fixed in 14.6
  • Fix · CNA macOS (Apple) Fixed in 14.1

Red Hat 2 advisories

  • RHSA-2025:10364 Released 2025-07-07 · Red Hat rating Important
    webkitgtk4 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 Moderate
    GNOME 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 11.3

    62 records Highest priority Priority CRITICAL 3 CRITICAL, 1 HIGH, 9 MEDIUM, 49 LOW

    Other records, highest priority first

    • TI-2021-11050 Out-of-bounds write in Apple macOSPriority CRITICAL 97
    • TI-2021-11046 Use after free in Apple iOS and iPadOSPriority CRITICAL 97
    • TI-2021-11042 Missing authorization in Apple macOSPriority HIGH 82
    Show all 62 records →
  • Release ·

    Apple macOS 14.6

    30 records Highest priority Priority CRITICAL 2 CRITICAL, 4 MEDIUM, 24 LOW

    Other records, highest priority first

    • TI-2021-11050 Out-of-bounds write in Apple macOSPriority CRITICAL 97
    • TI-2021-11115 Out-of-bounds write in Apple iOS and iPadOSPriority MEDIUM 42
    • TI-2021-11091 Buffer overflow in Apple iOS and iPadOSPriority MEDIUM 42
    Show all 30 records →
Show 3 more groups
  • Release ·

    Apple macOS 14.1

    11 records Highest priority Priority CRITICAL 1 CRITICAL, 5 MEDIUM, 5 LOW

    Other records, highest priority first

    • TI-2021-11174 Apple iOS: Processing maliciously crafted web content may lead to code executionPriority MEDIUM 42
    • TI-2021-11172 Use after free in Apple iOSPriority MEDIUM 42
    • TI-2021-11115 Out-of-bounds write in Apple iOS and iPadOSPriority MEDIUM 42
    Show all 11 records →
  • Release ·

    Apple macOS 12.5

    4 records Highest priority Priority CRITICAL 3 CRITICAL, 1 MEDIUM

    Other records, highest priority first

    • TI-2021-11050 Out-of-bounds write in Apple macOSPriority CRITICAL 97
    • TI-2021-11046 Use after free in Apple iOS and iPadOSPriority CRITICAL 97
    • TI-2021-11118 Out-of-bounds write in Apple iOS and iPadOSPriority MEDIUM 41
    Show all 4 records →
  • Release ·

    Apple macOS 14.5

    2 records Highest priority Priority CRITICAL 2 CRITICAL

    Other records, highest priority first

    • TI-2021-11050 Out-of-bounds write in Apple macOSPriority CRITICAL 97
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix yet
Red Hat Enterprise Linux 7AffectedNo fix yet
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

  1. 2021-11-03 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2021-30663
  3. 2026-10-03 Alias added: GHSA-5g93-pf3w-6f59

References

Advisory 6

  • 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