CVE-2021-30858A use after free issue was addressed with improved memory management.
Updated under an hour ago ()
Does this affect you?
It affects Apple macOS and 5 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by Nov 17, 2021. Treat that date as your deadline.
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Free account, 1 product
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.
- CVSS
- 8.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-416
- Known exploited
- Added to CISA KEV Nov 3, 2021; federal remediation due Nov 17, 2021Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 13.38% (percentile 96)
- Assigned by
- apple
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Apple macOS apple:macos (from the name) | from unspecified before 11.6 | CNA record |
Apple iOS apple:ios (from the name) | from unspecified before 14.8 | CNA record |
apple ipados apple:ipados | from 13.1 before 14.8 | NVD |
apple iphone_os apple:iphone_os | before 12.5.5; from 13.0 before 14.8 | NVD |
apple macos apple:macos | before 11.6 | NVD |
fedoraproject fedora fedoraproject:fedora | 33; 34 | NVD |
debian debian_linux debian:debian_linux | 10.0; 11.0 | NVD |
References
- https://support.apple.com/en-us/HT212804x-refsource-misc, third-party-advisory
- https://support.apple.com/en-us/HT212807x-refsource-misc, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Sep/27mailing-list, x-refsource-fulldisc, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Sep/25mailing-list, x-refsource-fulldisc, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Sep/29mailing-list, x-refsource-fulldisc, third-party-advisory
- http://www.openwall.com/lists/oss-security/2021/09/20/1mailing-list, x-refsource-mlist
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO6DMTHZR57JDBOXPSNR2MKDMCRWV265/vendor-advisory, x-refsource-fedora, release-notes
- http://seclists.org/fulldisclosure/2021/Sep/38mailing-list, x-refsource-fulldisc, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Sep/39mailing-list, x-refsource-fulldisc, third-party-advisory
- https://www.debian.org/security/2021/dsa-4975vendor-advisory, x-refsource-debian, mailing-list, third-party-advisory
- https://www.debian.org/security/2021/dsa-4976vendor-advisory, x-refsource-debian, mailing-list, third-party-advisory
- https://support.apple.com/kb/HT212824x-refsource-confirm, third-party-advisory
- http://seclists.org/fulldisclosure/2021/Sep/50mailing-list, x-refsource-fulldisc, third-party-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XYNV7ASK4LQVAUMJXNXBS3Z7RVDQ2N3W/vendor-advisory, x-refsource-fedora, release-notes
- http://www.openwall.com/lists/oss-security/2021/10/26/9mailing-list, x-refsource-mlist
- http://www.openwall.com/lists/oss-security/2021/10/27/1mailing-list, x-refsource-mlist
- http://www.openwall.com/lists/oss-security/2021/10/27/2mailing-list, x-refsource-mlist
- http://www.openwall.com/lists/oss-security/2021/10/27/4mailing-list, x-refsource-mlist
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30858us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.