CVE-2021-30661A use after free issue was addressed with improved memory management.
Updated under an hour ago ()
Does this affect you?
It affects Apple iOS and iPadOS and 6 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 Safari 14.1, iOS 12.5.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5, macOS Big Sur 11.3. 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)
- 4.49% (percentile 91)
- Assigned by
- apple
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Apple iOS and iPadOS apple:ios_and_ipados (from the name) | from unspecified before 14.5 | CNA record |
Apple Safari apple:safari (from the name) | from unspecified before 14.1 | CNA record |
Apple tvOS apple:tvos (from the name) | from unspecified before 14.5 | CNA record |
Apple watchOS apple:watchos (from the name) | from unspecified before 7.4 | CNA record |
Apple macOS apple:macos (from the name) | from unspecified before 11.3 | CNA record |
apple safari apple:safari | before 14.1 | NVD |
apple ipados apple:ipados | before 14.5 | NVD |
apple iphone_os apple:iphone_os | before 12.5.3; from 14.0 before 14.5 | NVD |
apple macos apple:macos | from 11.0 before 11.3 | NVD |
apple tvos apple:tvos | before 14.5 | NVD |
apple watchos apple:watchos | before 7.4 | NVD |
References
- https://support.apple.com/en-us/HT212317x-refsource-misc, vendor-advisory
- https://support.apple.com/en-us/HT212323x-refsource-misc, vendor-advisory
- https://support.apple.com/en-us/HT212324x-refsource-misc, vendor-advisory
- https://support.apple.com/en-us/HT212325x-refsource-misc, vendor-advisory
- https://support.apple.com/en-us/HT212341x-refsource-misc, vendor-advisory
- https://support.apple.com/en-us/HT212318x-refsource-misc, vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30661third-party-advisory, us-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.