Integer overflow in Apple Icloud

CVE-2020-27911

An integer overflow was addressed through improved input validation. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 14.2 and iPadOS 14.2, iCloud for Windows 11.5, tvOS 14.2, iTunes 12.11 for Windows. A remote attacker may be able to cause unexpected application termination or arbitrary code execution.

Vulnerability class: Integer Overflow

EPSS: 0.032 (86.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2020-27911?
CVE-2020-27911 is a high-severity vulnerability in Apple Icloud, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2020-12-08.
How severe is CVE-2020-27911?
High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2020-27911 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.