What is CVE-2021-30663?

CVE-2021-30663 is a vulnerability in Apple Macos. Published 2021-09-08.

Is CVE-2021-30663 known to be exploited?

Yes. CVE-2021-30663 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 4 public proof-of-concept repositories are indexed.

Vulnerability in Apple Macos

CVE-2021-30663

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 arbit…

EPSS: 0.010 (76.8th percentile) — read the EPSS interpretation.

Affected products

Apple Macos — versions unspecified

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2021-11-17.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

support.apple.com/en-us/HT212532 (x_refsource_MISC)
support.apple.com/en-us/HT212534 (x_refsource_MISC)
support.apple.com/en-us/HT212341 (x_refsource_MISC)
support.apple.com/en-us/HT212335 (x_refsource_MISC)
support.apple.com/en-us/HT212336 (x_refsource_MISC)

Frequently asked questions

What is CVE-2021-30663?: CVE-2021-30663 is a vulnerability in Apple Macos. Published 2021-09-08.
Is CVE-2021-30663 known to be exploited?: Yes. CVE-2021-30663 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 4 public proof-of-concept repositories are indexed.