CVEs / CVE-2021-30665
CVE-2021-30665: Apple Multiple Products WebKit Memory Corruption Vulnerability
- Known exploited in the CISA KEV catalog since 3 Nov 2021
- high 8.8 CVSS 3.1 (NVD)
- EPSS 3.7% chance of exploitation in the next 30 days, higher than 89% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Apple iOS, iPadOS, macOS, watchOS, and tvOS WebKit contain a memory corruption 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.
Description
A memory corruption issue was addressed with improved state management. This issue is fixed in watchOS 7.4.1, iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, macOS Big Sur 11.3.1. 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 and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Apple macOS | from unspecified, before 11.3 | 11.3 |
| Apple macOS | from unspecified, before 14.5 | 14.5 |
| Apple macOS | from unspecified, before 7.4 | 7.4 |
| Apple macOS | from unspecified, before 12.5 | 12.5 |
| Apple macOS | from unspecified, before 14.6 | 14.6 |
Exploitation
| In CISA KEV since | 3 Nov 2021 |
|---|---|
| Due date for US federal agencies | 17 Nov 2021 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply updates per vendor instructions. |
Severity
| CVSS 3.1 | 8.8 highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-787 |
References
- CVE-2021-30665 on NVD
- CVE-2021-30665 in the CISA KEV catalog
- CVE-2021-30665 on OSV
- https://support.apple.com/en-us/HT212335 Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212336 Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212339 Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212341 Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212532 Release Notes, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30665 Third Party Advisory, US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.