What is CVE-2021-30797?

CVE-2021-30797 is a high-severity vulnerability in Apple iOS. CVSS score: 8.8/10. Published 2021-09-08.

How severe is CVE-2021-30797?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2021-30797 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Apple iOS

CVE-2021-30797

This issue was addressed with improved checks. This issue is fixed in iOS 14.7, Safari 14.1.2, macOS Big Sur 11.5, watchOS 7.6, tvOS 14.7. Processing maliciously crafted web content may lead to code execution.

Published 2021-09-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.019 (78.5th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Apple iOS — versions unspecified
Apple Ipados
Apple Iphone OS
Apple macOS — versions unspecified
Apple Safari
Apple tvOS
Apple watchOS

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

support.apple.com/en-us/HT212601 (Vendor Advisory)
support.apple.com/en-us/HT212602 (Vendor Advisory)
support.apple.com/en-us/HT212605 (Vendor Advisory)
support.apple.com/en-us/HT212604 (Vendor Advisory)
support.apple.com/en-us/HT212606 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-30797?: CVE-2021-30797 is a high-severity vulnerability in Apple iOS. CVSS score: 8.8/10. Published 2021-09-08.
How severe is CVE-2021-30797?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2021-30797 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.