CVE-2021-30858
HighActively exploited (CISA KEV)
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.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Apple iOS, iPadOS, and macOS
PublishedAug 24, 2021
First seenAug 24, 2021
Added to KEVNov 3, 2021
Weakness typeCWE-416Use after free
How to fix
CISA required action
Apply updates per vendor instructions.
CISA due date: Nov 17, 2021Update
- apple ipados14.8 or later
- apple iphone_os12.5.5, 14.8 or later
- apple macos11.6 or later
Vendor advisories
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/
- debian.org/security/2021/dsa-4975
- debian.org/security/2021/dsa-4976
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XYNV7ASK4LQVAUMJXNXBS3Z7RVDQ2N3W/
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| apple ipados | 13.1 ≤ v < 14.8 | 14.8 |
| apple iphone_os | v < 12.5.5, 13.0 ≤ v < 14.8 | 12.5.5, 14.8 |
| apple macos | v < 11.6 | 11.6 |
| fedoraproject fedora | 33, 34 | — |
| debian debian_linux | 10.0, 11.0 | — |
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