CVE-2021-30663 KEV
8.8
HIGH · CVSS 3.1 · EPSS 3.5% (pctl 89)
Patch first
On CISA KEV — known exploited in the wild, due 2021-11-17.
Description
An integer overflow was addressed with improved input validation. This issue is fixed in iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, Safari 14.1.1, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution.
Scoring
| CVSS | 8.8 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| EPSS | 3.49% — more likely to be exploited than 89% of all CVEs |
| Weakness | CWE-190 |
| On CISA KEV | yes — remediate by 2021-11-17 |
| Public exploit | none known |
| Published | 2021-09-08 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Apple Multiple Products WebKit Integer Overflow Vulnerability |
|---|---|
| Added | 2021-11-03 |
| Due | 2021-11-17 |
| Vendor / product | Apple / Multiple Products |
| Ransomware use | none reported |
Affected (5)
| Vendor | Product |
|---|---|
| apple | ipados |
| apple | iphone os |
| apple | macos |
| apple | safari |
| apple | tvos |
References
- https://support.apple.com/en-us/HT212335
- https://support.apple.com/en-us/HT212336
- https://support.apple.com/en-us/HT212341
- https://support.apple.com/en-us/HT212532
- https://support.apple.com/en-us/HT212534
- https://support.apple.com/en-us/HT212335
- https://support.apple.com/en-us/HT212336
- https://support.apple.com/en-us/HT212341
- https://support.apple.com/en-us/HT212532
- https://support.apple.com/en-us/HT212534
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30663
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