Buffer overflow in Apple Icloud

CVE-2020-9999

A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.0.1, iTunes for Windows 12.10.9. Processing a maliciously crafted text file may lead to arbitrary code execution.

Vulnerability class: Buffer Overflow

EPSS: 0.085 (94.5th 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-2020-9999?
CVE-2020-9999 is a high-severity vulnerability in Apple Icloud, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2020-12-08.
How severe is CVE-2020-9999?
High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2020-9999 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.