CVE-2021-30807
Apple Multiple Products Memory Corruption Vulnerability
- Published
- Oct 19, 2021
- Updated
- Oct 21, 2025
- Assigning CNA
- apple
- Evidence observed
- Nov 3, 2021
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HModerate · next 30 days
- Percentile
- 98.1%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
A memory corruption issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.5.1, iOS 14.7.1 and iPadOS 14.7.1, watchOS 7.6.1. An application may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue may have been actively exploited.
Sources
2- iomfb-exploitExploit
iOS 14 kernel exploit for CVE-2021-30807 targeting IOMobileFramebuffer, with tunable memory allocation for jailbreak development on A11+ devices.
- n-daysPoC
Curated collection of iOS kernel and userland exploit PoCs and writeups for in-the-wild and researched CVEs, including binary-diffed vulnerability analyses.
Responsible use
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