CVEvulnerability

CVE-2021-30858

8.8 HIGH Known exploited Published 2021-08-24 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

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

Apple iOS, iPadOS, and macOS WebKit contain a use-after-free vulnerability that leads to code execution when processing maliciously crafted web content. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.

Added to KEV
2021-11-03
Remediation due
2021-11-17
Ransomware use
Unknown
Required action
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2021-30858
Status
Analyzed
Published
2021-08-24
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.8 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
8.8 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
6.8 MEDIUM — AV:N/AC:M/Au:N/C:P/I:P/A:P
Weaknesses
CWE-416

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.

Affected configurations

• apple ipados (>= 13.1 < 14.8) • apple iphone os (< 12.5.5) • apple iphone os (>= 13.0 < 14.8) • apple macos (< 11.6) • fedoraproject fedora 33 • fedoraproject fedora 34 • debian debian linux 10.0 • debian debian linux 11.0

Related

Weakness · CWE (1)

References