Apple iOS, iPadOS, macOS Use-After-Free Vulnerability
Apple iOS, iPadOS, and macOS WebKit contain a use-after-free 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.
- Vendor
- Apple
- Product
- iOS, iPadOS, and macOS
- CVSS
- 8.8
- EPSS (exploit probability)
- 13.4%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2021-30858 being exploited?
Yes. CISA added CVE-2021-30858 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 13.4% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (14 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Apple iOS, iPadOS, and macOS CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2025-43300 Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability | [ CRITICAL ] | 10.0 | 32.0% | |
| CVE-2023-41064 Apple iOS, iPadOS, and macOS ImageIO Buffer Overflow Vulnerability | [ HIGH ] | 7.8 | 53.4% | |
| CVE-2023-28206 Apple iOS, iPadOS, and macOS IOSurfaceAccelerator Out-of-Bounds Write Vulnerability | [ HIGH ] | 8.6 | 23.2% | |
| CVE-2021-30900 Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability | [ HIGH ] | 7.8 | 5.2% | |
| CVE-2022-32917 Apple iOS, iPadOS, and macOS Remote Code Execution Vulnerability | [ HIGH ] | 7.8 | 5.6% | |
| CVE-2020-9934 Apple iOS, iPadOS, and macOS Input Validation Vulnerability | [ MEDIUM ] | 5.5 | 3.2% | |
| CVE-2022-22620 Apple iOS, iPadOS, and macOS Webkit Use-After-Free Vulnerability | [ HIGH ] | 8.8 | 16.3% | |
| CVE-2021-30869 Apple iOS, iPadOS, and macOS Type Confusion Vulnerability | [ HIGH ] | 7.8 | 4.1% |