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CVE-2021-30858

Apple iOS, iPadOS, macOS Use-After-Free Vulnerability

  • High 8.8
  • Exploited: added to CISA KEV 3 Nov 2021

Description

A use after free issue was addressed with improved memory management. This issue is fixed in iOS 14.8 and iPadOS 14.8, macOS Big Sur 11.6. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

Key facts

Published
24 Aug 2021
Last changed
21 Oct 2025
Assigned by
apple
KEV added
3 Nov 2021
KEV fix due
17 Nov 2021
EPSS
13.379% likely to be exploited in the next 30 days, higher than 96.48% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 8.8CVSS 3.1, Highfrom CISA (ADP container)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

What to do

  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
ApplemacOS
  • unspecified up to but excluding 11.6 (affected)
AppleiOS
  • unspecified up to but excluding 14.8 (affected)

Timeline

  1. 24 Aug 2021 Published
  2. 3 Nov 2021 CVE-2021-30858 added to CISA KEV
  3. 3 Nov 2021 Added to the CISA KEV catalogue

Weakness

References