What is CVE-2021-30663?

CVE-2021-30663 is a high-severity vulnerability in Apple Ipados, classified under Integer Overflow or Wraparound. CVSS score: 8.8/10. Published 2021-09-08.

How severe is CVE-2021-30663?

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

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.

Integer overflow in Apple Ipados

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…

Vulnerability class: Integer Overflow

EPSS: 0.037 (88.5th percentile) — read the EPSS interpretation.

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.

Affected products

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

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

product-security@apple.com (x_refsource_MISC, Release Notes, Vendor Advisory)
product-security@apple.com (x_refsource_MISC, Release Notes, Vendor Advisory)
product-security@apple.com (x_refsource_MISC, Release Notes, Vendor Advisory)
product-security@apple.com (x_refsource_MISC, Release Notes, Vendor Advisory)
product-security@apple.com (x_refsource_MISC, Release Notes, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Third Party Advisory, US Government Resource)

Frequently asked questions

What is CVE-2021-30663?: CVE-2021-30663 is a high-severity vulnerability in Apple Ipados, classified under Integer Overflow or Wraparound. CVSS score: 8.8/10. Published 2021-09-08.
How severe is CVE-2021-30663?: High severity. CVSS v3 base score is 8.8 out of 10.
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.